An Administrator will have to do this for you. On the FAQ page there is a link Contact Us it's the link to email an admin, just tell them your current screen name and the "new and improved" name that you would like instead. It may take a day or 2.
I have been reading your situation and these guys are giving you some great advice. Before any positive action can take place you have to first start with a positive thought to make it happen. All action starts in the mind that God gave to you to make things happen. You can do this man!
