To use two factor authentication go through the following steps:
Download a two-factor authenticator app like Microsoft Authenticator for Windows Phone, Android and iOS or Google Authenticator for Android and iOS.
Scan the QR Code or enter the key into your two factor authenticator app. Spaces and casing do not matter.
Once you have scanned the QR code or input the key above, your two factor authentication app will provide you with a unique code.Enter the code in the confirmation box below.