First, click on the arrow to the right side into the Settings- click again (directly www.facebook.com/settings). From the left, click on Security-. Login Approvals- edit- Click on the right side. Then Require a security code to access my account from unknown browsers check box. Checking the time when a new message, click on the Get Started-.
Continue- click again when a new message. Facebook to add your mobile phone number if you do not add now. And if your mobile phone can be a code number to the code Continue- down box at the back. When you enter the password and click Submit-. Then click Close-.
Login Alerts- now by clicking on the right side of edit- Get notifications and E-mail login alerts to E-mail address- Click Click Save Changes-. From now on any computer other than your computer each time you log in to your Facebook account if you want to enter a code number to your mobile phone.
Continue entering the code number this box if you would go into your Facebook account. So your Facebook password is stolen nobody will be able to log into your Facebook do not know the code number of the mobile phone.