well, to open the group to join request you have to go to de "Admin Area"...
Then press the "Manage Members" button at the left of the screen
Then press "Members" in the list at the left
Then, at right, there is a drop down for "Join Requests"... you have to select "Are Automatically Aproved"
And finally, press the "Save Now" button located in the bottom left of the screen.
I WANT TO JOIN!!!