OK this group is becoming very un-organized. If you challenge someone, Write in the challenge thread. ONLY challenges should be posted. Moderators should delete any off-topic post, even questions.
Just to clarify, the only thing in the challenge thread should be:
"I challenge _____"
Note: you don't set the theme here either.
Now that you've challenged someone and they accept, Create a new thread with your names. As soon as a moderator sees a new thread, they will give a theme. You can either agree to the theme or figure one out among yourselves.
So you'll make your very own thread that you will use to determine the theme and contest dates.
We now skip ahead to when you and you're opponent are done building, and are ready to be judged. You will have already made your page for the MOC and followed the rules for doing so. You or your opponent will now post in the "ready to be judged" thread. A mod will then visit your moc, and judge it.