Hmm.. it seems that i cannot change the admin group background unless i am the original admin.. I logged in with the account that i created the forum with and it showed me the options to change the pic..
@zandertrek Not a new feature. Been around for a while. Although less than intuitive to create. I also find many low tech users confused by group chats due to being stuck in the functional fixedness of "private chat". That said, I like 'em. 👍