I did some due diligence in both Googling generally and searching this forum, but somehow didn't find this.
What's the link to the page where users sign up for a subscription to a usergroup? It might be a good idea to have this link propagate into the nav bar automatically or something if the admin sets up any subscription groups. Or at least add info telling admins on the /admin/payment_settings.php screen what link to add manually to their nav structure or "call to action" post when they decide to use subscriptions. Maybe it's already there, but I'm missing it. I promise, I looked hard! Thank you!