* To register your nickname, use /nickserv register PASSWORD E-MAIL where PASSWORD is the nickname password you wish to use (something hard to guess and easy to remember) and E-MAIL is a *working* e-mail address. A confirmation code will be sent to you via e-mail. Go to your inbox and retrieve it, confirming your nickname as fast as possible, because the confirmation code will expire after a while. It will usually be something like /nickserv auth CONFIRMATIONCODE where CONFIRMATIONCODE is... the confirmation code. Yeah.
* If you have already registered your nickname, you will have to identify yourself to prove you are its owner. Use /nickserv identify PASSWORD where PASSWORD is the password you previously used to register your nickname. You'll have to do this every time you connect to the server, otherwise you can't use your nickname or join #lurk. You don't have to identify yourself right after the registration, though. Only after you disconnect and then reconnect.