change your nick to the one you want to register

/nick <yournick>

now type

/msg nickserv register <password> <email>

now when that is done type

/msg nickserv identify <password>


<yournick> = the nick you want to have registered
<password> = the password you want to register with that nickname
<email> = your email

Did you go check your email after registering?
Did it say anything in your status screen, like can't register nick, or something similar?
If you can get onto IRC, goto irc.rizon.net and goto #gotwoot