Open the settings window by using the command XREFDRAGSETTINGS, type this command into the command line, and press enter. In the settings window, you can customize the settings to fit your preferences. These changes will be saved for future use.

Open the drag-and-drop window by using the command XREFDRAG, type this command into the command line, and press enter. 

To add files as external references using the drag-and-drop feature, navigate to the files you want to include in the file explorer, then drag and drop them into the designated box within the palette. The files will automatically be added as external references. 

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. You may need to restart the Autodesk product to activate the app/plug-in. 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, click Control Panel > Programs > Programs and Features (Windows 7/8.1/10/11) and uninstall as you would any other application from your system.