Forums generally don't allow name changes. It confuses everybody when "bob" is suddenly "jim" and whatnot.
However, we can do this for you. Just please think about what name you want and stick to the new name.
send a message to administrators using this link, with the name you want to get. They can make sure it is available and change your name if it is:
http://www.guitartricks.com/contact.php
Jon