How to actually get into iOS beta?

Can anyone give me some advice on how to actually get in the iOS and Apple TV beta? I’ve tried signing up multiple times over the years, and never gotten a response. Never really cared because there was never a real reason for me to care about it. Today I learn it fixes the iOS 11 issues. As a Plex Pass member I think we should all get approved if we opt in. What is the hold up for getting users approved? In the thread on the iOS message board there seems to be a lot of confusion with no one knowing how to actually enter the beta.

I’m interested in this as well.