Authenticator App
To protect your account with an additional layer of login security you will need to have an authenticator application installed on your mobile phone or tablet that supports time based one-time pass-codes (TOTP).
Authenticator apps use the camera in the device to to scan the QR Code and then start to generate a new 6 digit pass-code every 30 seconds.
After successful registration you will need to provide the latest code from your authenticator every time you login.
Installing an App.
The user must select an authenticator app to use and download from the appropriate app. store (Apple, Android etc). There are many available including from Microsoft, Google, Oracle; but it is a user choice.
The app itself will provide the necessary instructions for set-up and creating and managing the account.