Join a channel, if it says that "This channel is not registered" then you type /cbregister. That's it.
Other commands:
/cblevel ID Level - 0 None 1 User 2 Moderator 3 Admin 4 Owner
/cbkick ID
/cbban ID
/cblock
/cbunlock
/cbalert Message
/cbentry Entry Message
and to delete it
/cbdelete