Registers your nickname in the NickServ database. Once your nick is registered, you can use the SET and ACCESS commands to configure your nick’s settings as you like them.
Make sure you remember the password you use when registering – you’ll need it to make changes to your nick later. (You can reset it with the RESETPASS command)
(Note that case matters! IRC4FUN, IRC4Fun, and irc4fun are all different passwords!)
Guidelines on choosing passwords: Passwords should not be easily guessable. For example, using your real name as a password is a bad idea. Using your nickname as a password is a much worse idea ;) (In fact, NickServ will not allow it anymore.) Also, short passwords are vulnerable to trial-and-error searches, so you should choose a password at least 7 characters long. Finally, the space character cannot be used in passwords.
This command also creates a new group for your nickname, that will allow you to register other nicks later sharing the same configuration, the same set of memos and the same channel privileges.
/NS register password email
/msg NickServ register MyPassword firstname.lastname@example.org