How to set Two-Factor Authentication in your Facebook Account.
Step 1:
Login to your account
Step 2:
Tap the three lines = in the top right corner
Step 3:
Scroll to the bottom and tap Settings.
Step 4:
Scroll down and tap Password and security.
Step 5:
Scroll down and tap Use two-factor authentication. You may be asked to enter your password at this point.
Step 6:
Tap Use authentication app or Text message (SMS).
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