Did you make your ingame account? If you did not, the forum and game aren't connected. You would need to go to "New account" And put all the forum information there. Otherwise I don't know, if you could screenshot the error message I might be able to help you more. If you could give me that screenshot, I will sit on my butt for 2 hours typing up a help reply ^_^
Hope this helped!
~Da crazy one be out,