Edit "Checkout our growing community network, why not join one of them?"

Hello, I'm trying to edit "Checkout our growing community network, why not join one of them?" on the homepage of Blogs MU theme. It's not anywhere in the Theme or BuddyPress options that I can find but near as I can tell it's coming from the BuddyPress groups. Can you tell me where I need to go to edit this please? Thanks!