Log into the Facebook app. Tap More in the bottom right-hand corner.
Scroll down and select Privacy Shortcuts. From here you can control who can see what you post and what you’re tagged in.
You can also control who can contact you and who can send you friend requests.
This is also where you can go in order to block someone if they’re bothering you. Tap How do I stop someone from bothering me? Then add their name from the drop-down menu, and tap the blue button that says Block.