If the nick you choose is already registered, you will see:
-NickServ- This nick is owned by someone else. Please choose another.
(If this is your nick, type /msg NickServ IDENTIFY password.)
-NickServ- To add your current hostmask to your access list, type
/msg NickServ ACCESS ADD now.
-NickServ- If you do not change nicks within one minute, you will be
forced off the network.
when you get connected. You can solve the problem simply by typing:
If the nick you choose is being used by someone else, you will see:
*** name :Nickname is already in use.
If that happens, you can solve the problem simply by typing a new nickname at the "Nickname:" prompt.