Follow steps at http://blog.freenode.net/2008/04/registering-a-channel-on-freenode/
Ensure you are connected with the right nick:
/nick <your-right-nick>
Register your nick or log in:
/msg nickserv register <your-password> <your-email> /msg nickserv identify <password>
Check if #fudforum is registered:
/msg ChanServ info #fudforum
If not, register it:
/msg ChanServ register #fudforum
To regain OP status after disconnect:
/msg ChanServ OP #fudforum <your-nick>
http://freenode.net/group_registration.shtml
Form was completed & submitted on 16 March 2010.