Set up the options in the dialog box after opening the application. Next, specify the top line and the base of the slope. After which the temporary continuous strokes is built. If you go into edit mode> the position of strokes, you must first select the extreme strokes to indicate the ranges, then select an editable stroke and show it the new position.

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 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 7/8/8.1/10) and uninstall as you would any other application from your system.

In Civil 3D 2015, there may be problems with the loading the application dialog. installing service pack 3 will fix the problem

https://knowledge.autodesk.com/support/autocad-civil-3d/downloads/caas/downloads/content/autodesk-C2-AE-autocad-C2-AE-civil-3d-C2-AE-2015-service-pack-3.html