1) Install Office on your Mac - refer to
- How to Install office 365 on Macbook for details
2) Click Launchpad icon in the Dock to Display all of your apps.
3) Click on any Office app, like Word, to start the activation process.
4) A What's New window will pop-up. Click Get started and Sign in with your Dio email address and Password.
Note: If there is no What's New window, you may need to activate from within the Office app. On the top menu, click Word >Activate Office > Sign in.
5) Once you enter Dio Credentials, it should say Activating and Green tick saying you're all set.
For More information follow this Link :-