The add on is active, however when I press Q both in object and edit mode, nothing happens, could someone help?
Forget the Addon.
When you press Q, you get acces to your quick favorites in modern Blender. Now, when you find something that you use a lot (like Shade Smooth, for instance), you can right click on the command and add it to your Quick Favorites Menu:
Also works from the Search:
You can add all those Tools from the Addon in your Q menu.