KI 1914 Microsoft 365 Add-ins
The method is the same for Windows and Mac.
How to add an Add-In in Word?
Firstly (after the access is granted), go the the tab Home and select Add-ins, or you can search for “Add-ins” in the search box in the title bar.Select the add-in from the list. If it's not visible, select More Add-ins and in the dialog window that opens, click Refresh (in the top right corner).
Select then the add-in and click Add in the lower right corner.
The add-in should now be visible in the toolbar in Word. In the first image in this knowledge item you can see some examples. Launch the add-in by clicking a button belonging to it.