hello Regarding DA

is it possible to point http://server.blabla.eu:2222 to only http://blabla.eu:2222 but so http://blabla.eu:222 wil be available at http://blabla.eu but also so that there is plugin that alows vistors to create a password and login as an user only ?

i hope some understand what i mean i hope i posted the right place