How to enable inband registration in ejabberd 15.07?

My ejabberd.yml of ejabberd 15.07

###
### ejabberd configuration file
###
###

### The parameters used in this configuration file are explained in more detail
### in the ejabberd Installation and Operation Guide.
### Please consult the Guide in case of doubts, it is included with
### your copy of ejabberd, and is also available online at
### http://www.process-one.net/en/ejabberd/docs/

### The configuration file is written in YAML.
### Refer to http://en.wikipedia.org/wiki/YAML for the brief description.
### However, ejabberd treats different literals as different types:
###
### - unquoted or single-quoted strings. They are called "atoms".
### Example: dog, 'Jupiter', '3.14159', YELLOW
###
### - numeric literals. Example: 3, -45.0, .0
###
### - quoted or folded strings.
### Examples of quoted string: "Lizzard", "orange".
### Example of folded string:
### > Art thou not Romeo,
### and a Montague?

### =======
### LOGGING

##
## loglevel: Verbosity of log files generated by ejabberd.
## 0: No ejabberd log at all (not recommended)
## 1: Critical
## 2: Error
## 3: Warning
## 4: Info
## 5: Debug
##
loglevel: 4

##
## rotation: Describe how to rotate logs. Either size and/or date can trigger
## log rotation. Setting count to N keeps N rotated logs. Setting count to 0
## does not disable rotation, it instead rotates the file and keeps no previous
## versions around. Setting size to X rotate log when it reaches X bytes.
## To disable rotation set the size to 0 and the date to ""
## Date syntax is taken from the syntax newsyslog uses in newsyslog.conf.
## Some examples:
## $D0 rotate every night at midnight
## $D23 rotate every day at 23:00 hr
## $W0D23 rotate every week on Sunday at 23:00 hr
## $W5D16 rotate every week on Friday at 16:00 hr
## $M1D0 rotate on the first day of every month at midnight
## $M5D6 rotate on every 5th day of the month at 6:00 hr
##
log_rotate_size: 10485760
log_rotate_date: ""
log_rotate_count: 1

##
## overload protection: If you want to limit the number of messages per second
## allowed from error_logger, which is a good idea if you want to avoid a flood
## of messages when system is overloaded, you can set a limit.
## 100 is ejabberd's default.
log_rate_limit: 100

##
## watchdog_admins: Only useful for developers: if an ejabberd process
## consumes a lot of memory, send live notifications to these XMPP
## accounts.
##
## watchdog_admins:
## - "admin@example.com"

### ================
### SERVED HOSTNAMES

##
## hosts: Domains served by ejabberd.
## You can define one or several, for example:
## hosts:
## - "example.net"
## - "example.com"
## - "example.org"
##
hosts:
- "example.com"

##
## route_subdomains: Delegate subdomains to other XMPP servers.
## For example, if this ejabberd serves example.org and you want
## to allow communication with an XMPP server called im.example.org.
##
## route_subdomains: s2s

### ===============
### LISTENING PORTS

##
## listen: The ports ejabberd will listen on, which service each is handled
## by and what options to start it with.
##
listen:
-
port: 5222
module: ejabberd_c2s
max_stanza_size: 65536
shaper: c2s_shaper
access: c2s
starttls: true
certfile: "/Applications/XAMPP/xamppfiles/htdocs/ejabberd_example_com/ejabberd.pem"
## Custom OpenSSL options
##
## protocol_options:
## - "no_sslv3"
## - "no_tlsv1"
-
port: 5269
module: ejabberd_s2s_in
max_stanza_size: 131072
shaper: s2s_shaper
##
## ejabberd_service: Interact with external components (transports, ...)
##
## -
## port: 8888
## module: ejabberd_service
## access: all
## shaper_rule: fast
## ip: "127.0.0.1"
## hosts:
## "icq.example.org":
## password: "secret"
## "sms.example.org":
## password: "secret"

##
## ejabberd_stun: Handles STUN Binding requests
##
## -
## port: 3478
## transport: udp
## module: ejabberd_stun

##
## To handle XML-RPC requests that provide admin credentials:
##
## -
## port: 4560
## module: ejabberd_xmlrpc
-
port: 5280
module: ejabberd_http
request_handlers:
"/websocket": ejabberd_http_ws
# "/pub/archive": mod_http_fileserver
web_admin: true
http_poll: false
http_bind: true
## register: true
captcha: false

##
## s2s_use_starttls: Enable STARTTLS + Dialback for S2S connections.
## Allowed values are: false optional required required_trusted
## You must specify a certificate file.
##
## s2s_use_starttls: optional

##
## s2s_certfile: Specify a certificate file.
##
## s2s_certfile: "/Applications/ejabberd-15.07/conf/server.pem"

## Custom OpenSSL options
##
## s2s_protocol_options:
## - "no_sslv3"
## - "no_tlsv1"

##
## domain_certfile: Specify a different certificate for each served hostname.
##
## host_config:
## "example.org":
## domain_certfile: "/Applications/ejabberd-15.07/conf/example_org.pem"
## "example.com":
## domain_certfile: "/Applications/ejabberd-15.07/conf/example_com.pem"

##
## S2S whitelist or blacklist
##
## Default s2s policy for undefined hosts.
##
## s2s_policy: s2s

##
## Outgoing S2S options
##
## Preferred address families (which to try first) and connect timeout
## in milliseconds.
##
## outgoing_s2s_families:
## - ipv4
## - ipv6
## outgoing_s2s_timeout: 10000

### ==============
### AUTHENTICATION

##
## auth_method: Method used to authenticate the users.
## The default method is the internal.
## If you want to use a different method,
## comment this line and enable the correct ones.
##
auth_method: internal

##
## Store the plain passwords or hashed for SCRAM:
## auth_password_format: plain
## auth_password_format: scram
##
## Define the FQDN if ejabberd doesn't detect it:
## fqdn: "server3.example.com"

##
## Authentication using external script
## Make sure the script is executable by ejabberd.
##
## auth_method: external
## extauth_program: "/path/to/authentication/script"

##
## Authentication using ODBC
## Remember to setup a database in the next section.
##
## auth_method: odbc

##
## Authentication using PAM
##
## auth_method: pam
## pam_service: "pamservicename"

##
## Authentication using LDAP
##
## auth_method: ldap
##
## List of LDAP servers:
## ldap_servers:
## - "loalhost"
##
## Encryption of connection to LDAP servers:
## ldap_encrypt: none
## ldap_encrypt: tls
##
## Port to connect to on LDAP servers:
## ldap_port: 389
## ldap_port: 636
##
## LDAP manager:
## ldap_rootdn: "dc=example,dc=com"
##
## Password of LDAP manager:
## ldap_password: "******"
##
## Search base of LDAP directory:
## ldap_base: "dc=example,dc=com"
##
## LDAP attribute that holds user ID:
## ldap_uids:
## - "mail": "%u@mail.example.org"
##
## LDAP filter:
## ldap_filter: "(objectClass=shadowAccount)"

##
## Anonymous login support:
## auth_method: anonymous
## anonymous_protocol: sasl_anon | login_anon | both
## allow_multiple_connections: true | false
##
## host_config:
## "public.example.org":
## auth_method: anonymous
## allow_multiple_connections: false
## anonymous_protocol: sasl_anon
##
## To use both anonymous and internal authentication:
##
## host_config:
## "public.example.org":
## auth_method:
## - internal
## - anonymous

### ==============
### DATABASE SETUP

## ejabberd by default uses the internal Mnesia database,
## so you do not necessarily need this section.
## This section provides configuration examples in case
## you want to use other database backends.
## Please consult the ejabberd Guide for details on database creation.

##
## MySQL server:
##
## odbc_type: mysql
## odbc_server: "server"
## odbc_database: "database"
## odbc_username: "username"
## odbc_password: "password"
##
## If you want to specify the port:
## odbc_port: 1234

##
## PostgreSQL server:
##
## odbc_type: pgsql
## odbc_server: "server"
## odbc_database: "database"
## odbc_username: "username"
## odbc_password: "password"
##
## If you want to specify the port:
## odbc_port: 1234
##
## If you use PostgreSQL, have a large database, and need a
## faster but inexact replacement for "select count(*) from users"
##
## pgsql_users_number_estimate: true

##
## ODBC compatible or MSSQL server:
##
## odbc_type: odbc
## odbc_server: "DSN=ejabberd;UID=ejabberd;PWD=ejabberd"

##
## Number of connections to open to the database for each virtual host
##
## odbc_pool_size: 10

##
## Interval to make a dummy SQL request to keep the connections to the
## database alive. Specify in seconds: for example 28800 means 8 hours
##
## odbc_keepalive_interval: undefined

### ===============
### TRAFFIC SHAPERS

shaper:
##
## The "normal" shaper limits traffic speed to 1000 B/s
##
normal: 1000

##
## The "fast" shaper limits traffic speed to 50000 B/s
##
fast: 50000

##
## This option specifies the maximum number of elements in the queue
## of the FSM. Refer to the documentation for details.
##
max_fsm_queue: 1000

###. ====================
###' ACCESS CONTROL LISTS
acl:
##
## The 'admin' ACL grants administrative privileges to XMPP accounts.
## You can put here as many accounts as you want.
##
admin:
user:
- "admin": "example.com"

##
## Blocked users
##
## blocked:
## user:
## - "baduser": "example.org"
## - "test"

## Local users: don't modify this.
##
local:
user_regexp: ""

##
## More examples of ACLs
##
## jabberorg:
## server:
## - "jabber.org"
## aleksey:
## user:
## - "aleksey": "jabber.ru"
## test:
## user_regexp: "^test"
## user_glob: "test*"

##
## Loopback network
##
loopback:
ip:
- "127.0.0.0/8"

##
## Bad XMPP servers
##
## bad_servers:
## server:
## - "xmpp.zombie.org"
## - "xmpp.spam.com"

##
## Define specific ACLs in a virtual host.
##
## host_config:
## "localhost":
## acl:
## admin:
## user:
## - "bob-local": "localhost"

### ============
### ACCESS RULES
access:
## Maximum number of simultaneous sessions allowed for a single user:
max_user_sessions:
all: 10
## Maximum number of offline messages that users can have:
max_user_offline_messages:
admin: 5000
all: 100
## This rule allows access only for local users:
local:
local: allow
## Only non-blocked users can use c2s connections:
c2s:
blocked: deny
all: allow
## For C2S connections, all users except admins use the "normal" shaper
c2s_shaper:
admin: none
all: normal
## All S2S connections use the "fast" shaper
s2s_shaper:
all: fast
## Only admins can send announcement messages:
announce:
admin: allow
## Only admins can use the configuration interface:
configure:
admin: allow
## Admins of this server are also admins of the MUC service:
muc_admin:
admin: allow
## Only accounts of the local ejabberd server can create rooms:
muc_create:
local: allow
## All users are allowed to use the MUC service:
muc:
all: allow
## Only accounts on the local ejabberd server can create Pubsub nodes:
pubsub_createnode:
local: allow
## In-band registration allows registration of any possible username.
## To disable in-band registration, replace 'allow' with 'deny'.
register:
all: allow
## Only allow to register from localhost
trusted_network:
loopback: allow
## Do not establish S2S connections with bad servers
## s2s:
## bad_servers: deny
## all: allow

## By default the frequency of account registrations from the same IP
## is limited to 1 account every 10 minutes. To disable, specify: infinity
## registration_timeout: 600

##
## Define specific Access Rules in a virtual host.
##
## host_config:
## "localhost":
## access:
## c2s:
## admin: allow
## all: deny
## register:
## all: deny

### ================
### DEFAULT LANGUAGE

##
## language: Default language used for server messages.
##
language: "en"

##
## Set a different default language in a virtual host.
##
## host_config:
## "localhost":
## language: "ru"

### =======
### CAPTCHA

##
## Full path to a script that generates the image.
##
## captcha_cmd: "/Applications/ejabberd-15.07/lib/ejabberd-15.07/priv/tools/captcha.sh"

##
## Host for the URL and port where ejabberd listens for CAPTCHA requests.
##
## captcha_host: "example.org:5280"

##
## Limit CAPTCHA calls per minute for JID/IP to avoid DoS.
##
## captcha_limit: 5

### =======
### MODULES

##
## Modules enabled in all ejabberd virtual hosts.
##
modules:
mod_adhoc: []
mod_announce: # recommends mod_adhoc
access: announce
## mod_blocking: [] # requires mod_privacy
mod_caps: []
mod_carboncopy: []
mod_configure: [] # requires mod_adhoc
mod_disco: []
## mod_echo: []
## mod_irc: []
mod_http_bind: []
## mod_http_fileserver:
## docroot: "/var/www"
## accesslog: "/Applications/ejabberd-15.07/logs/access.log"
mod_last: []
mod_muc:
## host: "conference.@HOST@"
access: muc
access_create: muc_create
access_persistent: muc_create
access_admin: muc_admin
## mod_muc_log: []
mod_offline:
access_max_user_messages: max_user_offline_messages
## mod_ping: []
## mod_pres_counter:
## count: 5
## interval: 60
mod_privacy: []
mod_private: []
## mod_proxy65: []
mod_pubsub:
access_createnode: pubsub_createnode
## reduces resource comsumption, but XEP incompliant
ignore_pep_from_offline: true
## XEP compliant, but increases resource comsumption
## ignore_pep_from_offline: false
last_item_cache: false
plugins:
- "flat"
- "hometree"
- "pep" # pep requires mod_caps
mod_register:
##
## Protect In-Band account registrations with CAPTCHA.
##
## captcha_protected: true

##
## Set the minimum informational entropy for passwords.
##
## password_strength: 32

##
## After successful registration, the user receives
## a message with this subject and body.
##
welcome_message:
subject: "Welcome!"
body: |-
Hi.
Welcome to this XMPP server.

##
## When a user registers, send a notification to
## these XMPP accounts.
##
## registration_watchers:
## - "admin1@example.org"

##
## Only clients in the server machine can register accounts
##
ip_access: trusted_network

##
## Local c2s or remote s2s users cannot register accounts
##
## access_from: deny

access: register
mod_roster: []
mod_shared_roster: []
## mod_time: []
mod_vcard: []
mod_version: []

##
## Enable modules with custom options in a specific virtual host
##
## append_host_config:
## "localhost":
## modules:
## mod_echo:
## host: "mirror.localhost"

##
## Enable modules management via ejabberdctl for installation and
## uninstallation of public/private contributed modules
## (enabled by default)
##

allow_contrib_modules: true

### Local Variables:
### mode: yaml
### End:
### vim: set filetype=yaml tabstop=8