/nick nickname | This will change your nickname, where "nickname" is the new nick you want. |
/msg nickserv help commands | This will list all the commands that you can use with you nickname. |
/msg NickServ register password e-mail | This will register your nickname, so no one else can take it and you can control your nick with other commands. "Password" is the password you choose and "e-mail" is your e-mail address. You must do this from the nick you want to register. |
/msg NickServ GROUP MainNick password | This will link another name to your current registration. It is like registering another nick, but easier. You must do this from from the name you want to add. |
/msg NickServ ghost nickname password | If you are disconnected, but your nick is still in the channel, you can use this to remove it. "Nickname" is the nick you want to remove, and "Password" is your password from registering your nick. |