Click "Add." Click "Next." Open the authenticator app you downloaded to your phone. If the app opens to the following screens, click "Accept," "Continue" and "Scan a QR Code." Then skip to step 11.

The app generates time-based one-time passwords (TOTPs) for an additional layer of security. The server generates a unique QR code for each user. Users scan the QR code using the Google Authenticator ...

Each site is different, but a site that works with Google Authenticator (or similar apps like Authy) will have an option to scan the QR code when setting up 2FA. You then open Google Authenticator ...

You can either scan a QR code using the camera on your smartphone or manually enter the code. When you see a QR code on the laptop screen, open the Google Authenticator app on your phone.