How do I confine membership to those that are invited and those whose subscriptions are approved by me?

Question

an advertising person joined my group. I didn't know that people could join from the web without my permission. What setting stops this?

Answer 1

management- under group settings click memberships- Membership Type and Welcome Message (Edit) <-- click the edit- check and select restricted- click save changes

this setting then requires you to approve membership

Answer 2

You could click management lower left column then click messages, scroll down to posting and archives click edit  and make changes as to who can post.  Click save changes.  I'm not sure if you can change who can join after you started  the group, possibly someone else will have an answer for that.