From Wix.com

How can I use the Google maps feature?

Go into the editor, left toolbar – Widgets > Google Maps.

When you've drag it into the editor, double click on it to start your navigation, and use the inner navigation bars and buttons to reach your address, or simply use the mouse to drag and double click for zooming options.

To set your address and add a marker> Go to Address on the bottom toolbar. You can also add text to the marker.