i know one way..
go to the e-mail you recieved for the registration (if you still have it)
and it should say if you did not register to this site please click here and it will be deleted

something like that

Yes, that is an option concept, but also...If you have a new nickname, Why do u need to delete the old one, Just leave it and don't use it...? Thats what I do anyway

Newbie alert Newbie ALERT