These are the steps:
Login to your Facebook account, at the top right corner go to 'Settings'
On the listed menu, click on the 'Security'
There will be series of questions for you to and other activities to enable.
Fill the appropriate things and your account is totally secured
These are what you will be given to fill
Security Question
Secure Browsing
Login Notifications
Login Approvals
Application Password
Recognized Devices
Active Sessions

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