Hey, I saw when you were having trouble opening a tester PM, I added screenshots to help. But could you please make this a pm. If you need additional help, feel free to DM me.
First, make sure that you just approved testers and not gifted the pattern. Then when you message testers and make an intro like this and click save, your testers will be added to the group. Sometimes there are glitches though. Then you click on message testers to access the group chat.