Click on the command icons in the Add-ins.

TL Grade Tool to launch the command. 

Or type in the commands manually at the Autodesk® AutoCAD® command prompt.

Follow the prompts to generate/query lines at specified grades.

The installer that ran when you downloaded this app/plugin from the Autodesk App Store will start installing the app/plugin. OR, simply double-click the downloaded installer to install the app/plugin.  You may need to restart the Autodesk product to activate the app/plugin. To uninstall this plugin, 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.