Hopefully this quote helps:
Send a request to one of the Administrators so they can delete it. They should be able to since they have most control over the forums.
Staff:
http://feral-heart.com/index.php?option=com_content&view=article&id=28&Itemid=52 (http://feral-heart.com/index.php?option=com_content&view=article&id=28&Itemid=52)
However note that the staff are quite busy, so it might take a while for them to delete your account, if they do.
Also for future reference, the registration opens everyday for about. 2 hours. If you check back every hour or so, I'm sure you'll see it open eventually.
You're welcome! Good luck with your new account.