Talk:The Cardinal's Judge/@comment-86.20.215.109-20130208235307/@comment-1321146-20130209072936

That is because you have already been referred.

A referral code is used to refer a friend to the game. Once they have been referred to the game, they cannot be referred to it again, as they already know it/play it.

Thus, you may only enter a friend's referral code once. - You may only enter one referral code in total.

You used to see a message under the referral code box saying something to that effect, but now they have simply removed the (useless) box from people that have already been referred.