How to participate in the web event "Rin+Yukio=Okumura"

This is an event, which will be held in Japan, about fan fiction of Blue Exorcist’s Rin Okumura & Yukio Okumura.
So that fans all over the world can enjoy this event, we made out a guide.
We would be glad very much if you carefully read the following rules and join in this event.