Register your nickname means, that no-one on the whole server, no matter which channel, is able to use your nickname except only you.
To ensure, that only you may use the nickname, you will get a password which identifies you.
Please don't register a nickname at once when you are here for the first time. Please check first whether you like it here to save us lots of dead nicks :-)
The registration of a nickname is very easy and will be done in 2 steps.
First of all let's check whether your nickname is still available. You may only register ONE nick per person.
(Please note that your password is mailed to the email address you supply so please check for correct spelling!)