monbron.. if you get to the login page your user name should be on the list to the left.. there is a column with squares.. one should have your user name just make sure it is highlighted. I looked at the uru on line forum page and it says this:
Don’t panic! While your password cannot be retrieved, it can easily be reset. Visit the login page and click I’ve forgotten my password. Follow the instructions and you should be able to log in again shortly.
if you can't get in perhaps you can give me your email address you used and I can post a question on t
the help page of the forum
edit
I also found this
May seem like a dumb question, but best to get the obvious one out of the way first
...
You are trying to log in using your email address aren't you and not your avatar name?
But assuming that you are using the email address, then getting rejected would suggest that your password is wrong, in which case you can reset your password here:
http://account.mystonline.com/accounts/reset.php (you do need to have access to the email address you use for login though, to get the validation emails).