After installing the add-in, select "3D Print Plus" under the MAKE menu.

Select a body to export and set the export parameters.

Click on the information icon at the bottom of the dialog to view the help file.

Install:
The installer that ran when you downloaded this app/plug-in from the Autodesk App Store will start installing the app/plug-in. Or, simply double-click the downloaded installer to install the app/plugin.

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.
To uninstall this plug-in, exit the Autodesk product if you are currently running it, simply rerun the installer, and select the "Uninstall" button.
Or, you can uninstall it from 'Control Panel/Programs and Features' (Windows 8.1/10/11), just as you would uninstall any other application from your system.

Some 3D print utilities are partially supported. More information on the Fusion 360 forum.