Link to French version: Comment activer un complément sur PowerPoint ?
Click on the "File" button:
Click on the "Options" button:
Select the "Add-Ins" tab:
Select "COM Add-In" at the bottom of the window in the drop-down list and then click the "enter" button:
Check the "Momindum Maker" module and uncheck all the other modules. Then validate with the "enter" button: