Hi shattered
When you visit the group, there is a message box just below the pictures, you can post a message the same as you would in a forum - to add pics, you need to have them in your personal albums, you can then send them to the group. It;s a little different to forum, as there are not individual threads to follow, but you can scroll down to see all the entries to date.
When we have enough members, I will add a forum to it
Hope that helps