Addressbook -> highlight -> add highlight. Put whatever you want in there $me for your name and maybe a shortened version of yuour name people call you and irc flashes for you if you are tabbed out.
![Image](http://img51.imageshack.us/img51/647/asadad.th.jpg)
You can add other words as and when it suits you. e.g. "boards" if you're looking to buy boards or something.