Type ATTST in the command line or click on the button at the Add-ins tab ribbon to start the command. Select the objects you want to insert the station values (blocks, texts, or Mtexts). Then, select the reference axis (a polyline or a Civil 3D alignment). A dialog box will appear.

If the selected objects are blocks, choose the attribute to fill with the station value in the list on the dialog box. If they are texts, the list will be empty, and the station value will overwrite the existing text values. Set the station prefix, station index increment, starting station, and precision. If you select a Civil 3D alignment as the reference axis, the station index and starting station will automatically be filled as alignment properties.

After setting all your preferences, press OK, and the station values will be inserted into the selected objects.

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.