I found the little teenie tiny "join group' button at the bottom of a page that was accessed from Social Forums, then under the LGBTQ heading it says "Click here to visit this social group", then it brings you to a page with all it's Members. At the bottom of that page you will see a teenie tiny button that says "join group", so I joined.

So it seems I was looking for the LGBTQ social group after all. A little confusing, but I got through it.