When you need to show the gridlines of a building or structure and annotate them with balloons, this tool will do the job for you. 

Providing the user has projected the workplanes (that represent the gridlines) from 3D model to drawing views, the tool will add balloons (sketched symbols) at both ends of each gridline with their corresponding names (equal to workplanes names).

The tool provides some formatting options such as scale, color and font of the balloons.

Also, you can move all the balloons from one row or column at the same time.

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

You can unload the plugin without uninstalling it by unchecking the "Loaded/Unloaded" check box associated with the plugin in the Autodesk® Inventor® Add-In Manager. You may have to restart Inventor to completely unload the application.

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 7/8.1/10), just as you would uninstall any other application from your system.