Type COORDGRID on the command line or click on the button at the Add-ins tab ribbon to start the command. 

Select the closed polylines to generate the coordinate grid and press enter.

The dialog box will appear. On the dialog box, set your preferences to generate the coordinate grid. You can set the line interval, text height, text style, x-axis and y-axis prefixes, and the layers for texts and lines. For the cross grid, you can also set the length of the lines.

After configuring the dialog box to your preferences, press OK, and the coordinate grids will be created in the drawing.

The installer that was run 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 your 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 system application.