Yep! If you go into "Profile" and look at the left side, you'll see the ability to change settings and an option to "Delete this Account." You could also do a full account reset if you look that the top of the forum and go to "user panel" and scroll down.
Deleting your forum account means you won't be able to go onto game anymore, since you have basically deleted your in-game account.
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.