Only admins are able to change the registration to "public" or "invitation only". Registration with the invitation means only the people who receive an invitation email from the admin(s) are able to register in the community. Follow the steps below to change the registration policy:
Admin Settings> Settigns> Access> Chnage Registration from "Public" to "Invitation Only"> Save changes.
How to invite someone through email to register:
Admin Settings> Members> Invitation> Insert email address and name> Add another or many at once> Change the role of the invited person in community> Customize your invitation email message if you want> Invite Members> you should receive the success message:
3. How to check the status of and revoke an invitation:
Click on the "Invited Users" from the top menu to see the list and the status of the sent invitations. You can also revoke the invitations from here: