Once you make an account with a name like "wolfqueenforever", you're stuck with that forever (unless you get a staff member to delete the account). If you want a different username than what you currently have, you have to create a new account.
Registration tends to open at random times 7 times and week and it's opened for 2 hours straight. You can find more registration information in this thread (http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&topic=50461.0). Extra information about accounts (http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&topic=32353.0).
While unable to change your username, you can always change your display name on the forums.
I hope this helped you.
My question is dumb too... Sorry to stray away but is it bad to comment on years-old posts?
Yes, it's called "Necro-Posting." There is really no need to bump them up, as the author has probably had their question solved. So if you need help yourself, better to just start your own thread.