Locate the Facebook app on your device’s home screen or app drawer, and tap on it.


Enter your registered email address and password in the fields at the middle of the screen then tap “Log in” to access to your account.
 Tap the Search bar at the top of the screen, and type in the Facebook name of the person you want to block. While typing, Facebook will suggest different users that match.


Tap the name of the person from the results, and you will be directed to his or her profile page.
 Tap the three-dot icon at the top right corner of the screen, and a drop-down menu will appear.


Select “Block” and a confirmation dialog box will appear.
Tap “Block” at the bottom right corner of the dialog box, and and the person will be blocked from your account.
Launch the Facebook app and log in.
Find the profile page of the person you want to block.
Block the person.
{"src": "wikihow-all_validation", "title": "How to Block Friends on Facebook4"}