RCR has some people on here automatically registered by dint of your current membership but she has to "approve" aka add you when you ask. You don't automatically join. She has a list of emails and names set up which she activates when she checks the request list.
If you ask to join and answer the questions including the rules then you will be allowed to join. Please remember that there can be no link to your HS moniker and your FB name. That way it creates another layer of privacy.
Yes Music45 - it is a private group. - I understand your concerns naturally, but unless you keep logged into FB and someone else has access to your phone or laptop, then it will be completely private.
Just make sure that your personal FB security settings prevent others from seeing too much of your profile. It is easy to do. That way people cannot access which groups you are a member of etc....
For example I am on there and if you search for me you will find that my information is very limited.
I am amazed at the number of people who do not do this. That way anyone from outside or strangers cannot access any of your bio or other details which is what FB recommends anyway.