The Add-In can be found in the DESIGN Workspace, SOLID tab, and MODIFY panel.

Start by creating a model with simple butt joints. Bodies to be joined should contact each other at a planar surface. Multiple bodies can be butted up against each other at any angle to form a box-like structure.

To create a Box Joint, open the Box Joint Add-In and select the outside faces of the bodies to join. A Box Joint will be created between every pair of bodies that butt up against each other.

A Box Joint feature can be modified at any time by selecting it in the timeline and choosing "Edit Feature".

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 Autodesk® Fusion 360®..
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 10/11), just as you would uninstall any other application from your system.

This Add-In can also be installed from GitHub by either:

1. Using GitHubToFusion360. Paste the GitHub link https://github.com/EvilHacker/BoxJoint into the GitHubToFusion360 Add-In.
2. Downloading the Add-In zip file from GitHub and extracting it to:

• %appdata%\Autodesk\Autodesk Fusion 360\API\AddIns (Windows)
• ~/Library/Application Support/Autodesk/Autodesk Fusion 360/API/AddIns (Mac OS)