I just did a quick check, your forum account uses the same email address as your game account. You can check what email address you're using here
I've also put your username/email into our account recovery system
You should receive two emails, one with your password and one with your key. They might go to Junk/Spam so please check there and mark them as Safe.
If you don't receive your emails, send a message to email@example.com
and we will follow up on that.