Your account has to be email verified, and currently your account is not email verified.
The easiest way I know to verify your account is to log into you account here: http://www.xgenstudios.com/game.php?keyword=stickarenaclassic
You will then get to this screen:
You’ll want to click “Log In”.
Once you do that, you’ll get to this screen:
You’ll then want to click what I have boxed in red.
It will then bring you to this:
Then you’ll just put in your username and password, followed by the email you would like to use on your account.
Once you press the OK button in the bottom right corner it will send you an email with a verification link. If you don’t see the email in your inbox, you might want to check your spam or junk inbox because sometimes it will put it in there.
Once you click the verification link, I believe then it will verify your account and you’ll be all set. And once you do that, your username should show up on the leaderboard.
Any questions feel free to shoot me a message!