apt-get -y install ejabberd

ejabberdctl register admin localhost password   (change password)

By default, hostname used by eJabberd is 'localhost', which can be modified from config file.
For our example we will call our admin user "admin@localhost" and modify the following lines in /etc/ejabberd/ejabberd.cfg:

/etc/ejabberd/ejabberd.cfg:

%% Admin user
{acl, admin, {user, "admin", "localhost"}}.

%% Hostname
{hosts, ["localhost"]}.


service ejabberd restart

http://198.199.90.115:5280/admin

https://www.digitalocean.com/community/tutorials/how-to-install-ejabberd-xmpp-server-on-ubuntu