The app will be available under the UTILITIES->ADDINS dropdown list. 

1. Select the screw, nut, or washer to be added.
2. Select the corresponding standard among them.
3. Select the size to be inserted, for screws, also select the length (Note: Only those sizes and lengths recommended by the standard can be inserted).
4. Select the edge of the circle or arc at the position to be inserted (Note: The object to be selected must belong to a component).
5. Select from the materials you have registered in your recommendations.
6. Select invert if necessary.

Install:
1. Download the installer from the Autodesk App Store.
2. Right-click on the "Downloads" folder and select "Open in Finder".
3. Right-click on the "FastenerTrial_macos.pkg" -> "Open With" -> "Installer".

Uninstall:
You can unload the add-in without uninstalling it by clicking the "Stop" button when the add-in is selected in the list box on the "Add-Ins" tab of the "Scripts and Add-Ins" dialog.
Unchecking "Run on Startup" causes the add-in not to be loaded in future sessions of Fusion.
- Navigate to the ./ApplicationsPlugins folder and select the app bundle you want to uninstall
- Either drag the app bundle to the Trash or right-click and select “Move to Trash”
- Right-click on the Trash-Can and select “Empty Trash”
- If you prefer keystrokes, you can also just select the app bundle and then hit Command+Delete to move the app to Trash, then empty the Trash and the app will be removed.