No you don't have to unless you find a nick which is already NOT registered and you wish to register it yourself. By registering it yourself it obviously has the same effect for anyone trying to use the nick you have registered as to what happens to you when using Saruman, due to this being registered already by another user. If you use a nick and it is not registered you can continue to use it as is, but don't be suprised if one day you log in and it comes up registered because someone else has got there first

To register your nickname in the chat room please type the following command changing the variables (words begining with a $ symbol as suits) including the begining / < slash.

/msg nickserv register $YOURPASSWORD $YOUREMAILADDRESS

You should then get a postBody from 'Nickserv' confirming the registration including information on your new memoserv box or an error postBody letting you know what was missing / you did wrong.

On one hand it is nice to have a registered nick, so nobody can be you. On the other hand, it is a pain to put in your password within 60 secs of logging in. If you forget, you bocome a nobody.

My nick is registred and I never get a time limit to write my password, it just says

-NickServ- This nick belongs to another user. Please change nicks
-NickServ- If this is your nick please try: /msg NickServ ID password

So I can chat without writing my password..

Whether or not a time limit (of your choice) is imposed depends on your server. If you use DalNet, for example, the default time limit is 60 seconds, but can be set anywhere up to 120. SorceryNet servers don't impose a time limit. I always use port 9000 of Iuturna.sorcery.net. Never lets me down.