First, welcome to the dorm of strength.
There's one requirement, you have to be an Obelisk Blue.
The rules are basically simple, like it says, send a private message to a forum administrator such as me, you'll know when you see their name colored sky blue.
They will reply by who will be your opponents, you'll have 3 opponents, one duel each, and when will you duel, you'll have one month to accomplish all duels, don't forgot to tell us your timezone!!
Duel screenshots are your only prove that you've won, don't forget to take one, reply back to the pm that we've sent, it should contain 3 screenshots.
After that, your good to go!! Good luck!!