1. Login your facebook account and click on setting on the right side of the page.

2. Click on " Security and Login" and find the "Use two-factor authentication" area, click "Edit".

3. Click "Get Started" to step further.

4.Click left side on "Text Message", then you'll finish the settings. After that you'll see the "Recovery Codes", click "Setup" and then you can get the recovery codes. Type 3 of them to the blanks on our site.