To enable two-factor authentication on your Facebook account for added security:

1. Open the Facebook app and log in.

2. Tap the three horizontal lines in the bottom-right corner (navigation menu).

3. Scroll down and tap on “Settings & Privacy,” then select “Settings.”

4. Scroll down to “Security and Login” and tap on it.

5. Under the “Two-Factor Authentication” section, tap “Use two-factor authentication.”

6. Choose the method you prefer: either “Authentication App” or “Text Message.”

– If you choose “Authentication App,” follow the on-screen instructions to set it up.
– If you choose “Text Message,” enter your mobile number and follow the prompts.

7. Once set up, you may be prompted to enter a code to confirm the two-factor authentication activation.

After completing these steps, your Facebook account will have an added layer of security with two-factor authentication.