Well, there is a pending invitation for you to join the group and I can delete your old account... otherwise go to the profile for the group and there is a link to join the group at the top of the page.
Let me know if that works for you.

I don't know? Do you want to be a maintainer on the community? It basically means you can add people, delete people and change some things. I still haven't figured out a lot of things I want to figure out about communities.