Final answer:
To add the Developer tab to the ribbon on a Mac, click on the Word or Excel menu, select Preferences, go to Ribbon & Toolbar, and check the Developer box. The Developer tab will then be visible in your ribbon.
Step-by-step explanation:
To add the Developer tab to the ribbon on a Mac, follow these simple steps:
- Open Microsoft Office application such as Word or Excel on your Mac.
 - Click on the Word or Excel menu depending on the application you have open, found in the upper left corner next to the Apple logo.
 - From the dropdown menu, select Preferences.
 - Under Authoring and Proofing Tools, click Ribbon & Toolbar.
 - In the Ribbon & Toolbar options, you'll see a list of tabs that can be added to your ribbon. Look for the Developer checkbox.
 - Check the box next to Developer to add the tab.
 - Close the Preferences window to save your changes.
 
Now the Developer tab should be visible in your ribbon, providing you access to features such as macros, add-ins, and other developer tools.