If you want to change your current two-factor authentication method, you must delete it and set up a new one. Do these steps.

1. Log in to the WebApp.
2. Go to the bottom left of your screen for Settings settings .
3. Click Security security .
4. Click the trash bin icon delete_forever and remove the old 2FA method.
5. Click SETUP.
   A new window opens.
6. Click NEXT.
7. Select the option SMS code or Authenticator app.
8. Click NEXT.
9. Verify your phone number or the Authenticator app.
10. In the last screen, download the backup codes.
    It is very important that you save these backup codes.The backup codes are usually stored in your Downloads folder.