Are you 18 years old or above?
Review posts friends tag you in before they appear on your timeline?
Timeline Review controls whether you have to manually approve posts you're tagged in before they go on your timeline. When you have a post to review, just click Timeline Review on the left hand side of your Activity Log.
Note: This only controls what's allowed on your timeline. Posts you're tagged in still appear in search, news feed and other places on Facebook
Review tags people add to your own posts before the tags appear on Facebook?
Turn off Tag Review to skip reviewing tags friends add to your content before they appear on Facebook. When someone who you're not friends with adds a tag to one of your posts you'll always be asked to review it.
Remember: When you approve a tag, the person tagged and their friends may be able to see your post.