I believe you have to be a premium supporter to do that. I could be wrong, however. I'm sure someone else will come in that can give you all the details.
Yeah, name changes are available to Premium Members. If it was the first couple days or so of your registration, we could probably change it without; but it says you've been registered for a year
In any case, once you sign up for Premium, you can change your name as you like every 3 months.