This forum / message board account system is an entirely different system from the game logins.
These forums will be going away entirely to be replaced with a system that uses your game login. The game login should be considered the "real one."
I'm almost done with the password change feature to let you change your password to anything you want, and then I'll be building out a new message system, with other features to customize your identity on the site. This confusion will finally go away.
In the meantime you can reset your password here: