Most small username's such as real name's, can not be entered.. don't have a clue why, hopefully it can be solved soon. But! As of that time, if your name says its taken, make a random name up, and make a thread that will be under " Name Changes " saying that you need your name changed to something.. your name can only be changed once.
Also, not forgetting, you will need o use a REAL e-mail, the reason for this is activation reasons so there are no bots, or hackers trying to access the forum trying to take over. Most of the time this does not occur, but it's all for security purpose's.. don't forget that.
Just a quick thread, just to inform you.