A little while ago I sent out the invites for the Official MCM League. Check your email that you signed up on the site with to see if you are one of the people that was invited to play. You have until Monday afternoon to accept the invite. At that point I will send your invite to someone else.
There is still plenty of time to set up your own fantasy league on Yahoo!. Yahoo! offers the best fantasy football experience on the internet. You can customize your league any way you want, and they have a really good mobile app that allows you to follow your team from anywhere.