If you want to change your nickname on the CCM forums, go to this link:

http://codes-sourceommentcamarcheet/profile/change_nickname. Please note that: You are allowed to use this feature only once, so choose your nickame wisely

What shall result from changing your nickname?

Your will keep previous questions and answers on the forums.

Redirection of your old username to the new one.

Alternatively, you can unsubscribe and then register again with your a new nickname, but you will lose your account history, private messages, and statistics.