They will only change your username if it is your real name or otherwise violates privacy. I don't think they will let you choose your new username anymore. Don't create a new account as multiple accounts aren't permitted and will get banned.
So are you saying that you can't change your screen name once you create one? I' am kinda confused. I know most forums can change it for you since I have asked one of the admin to change it and they did without problem.
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