How do I approve a follower request?
If your account is set to private, anyone who wants to see your photos or videos will have to send you a follower request. Follow Requests will appear in your Activity.
To approve or deny a request, tap the username of the person who requested to follow you. You'll be taken to their profile. Tap to approve the request or to deny the request.
If you accidentally deny a follow request, ask the person to request to follow you again.