Messed up my username

I was switching between tabs trying to fill in something different, and accidentally used my birthdate as my username. My birthdate is personal information and I don't want people to see it.

Is there a way my username can be changed? If possible, I'd rather use Painzilla-Badass (with the hyphen)

Sorry about the mistake.

@b03-28-1992:

This link will address your question.