
1. Go to facebook Settings.
2. Tap Security and Login then select Use two-factor authentication.
3. Select the Code Generator and tap the third party app link.
4. After tapping the link, you will be redirected to Set Up a Third Party App to Generate Codes. A QR code will pop-up in the screen which will be use in the next step.
5. Now launch the Authy (android app) in your smartphone and tap the 3 dots in the upper right corner.
6....