• Download Microsoft Authenticator
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• Link if unable to scan the code: https://www.microsoft.com/en-us/security/mobile-authenticator-app#downloadtheapp

• Go to account.microsoft.com 
• Sign in on the top right
• 
• On the left hand side, expand "My Account" and click on "Security Info"
• 
• Click on "Add sign-in method"
• 
• Choose "Microsoft Authenticator"
• 
• Follow the instructions on the next screens and scan the QR code from within the Microsoft Authenticator app. 
• At the end, a test notification will be prompted on your phone to verify that the MFA has been connected successfully.