Visitors can request to join the group so long as you have your group preferences set to only people you have invited can join.
- Go to your group's page and click the "Members" link on the right side of the page.
- Under "Add Member," click the "Requests" tab. If you have a new request, there will be a number notification in the tab.
- To approve an individual's request, click the "Add" button.
- To deny an individual's request, click the "Ignore" button.
- To approve all individuals, click the "Add All" button.