-Launch an Office product and see the banner on the top of the windows
-Click on the Re-activate or Activate button
*Make sure you are connected to a stable internet connection
-You are now connected to the web, log in to Office my account page
-Enter your Office Product key in its respective field and submit
To complete the activation, Office my account will verify information. when verification complete, you will see a confirmation message on the screen. If you facing problem get connected with Office customer support for assistance.