The site the is not most refined, but it works. Mud just created a Mud 'n Crud team on the site, invited me to join, and added me to the group. It seems to only work in that sequence. So, once you are registered, let us know. He will invite you to join the team. I didn't find a way to search for a particular group and request to join by myself.
Looks like Mud already raised 5 cents for breast cancer research fund.

I should ride more from now on.