Setting Up Gravity Geolocation
After installing and activating Gravity Geolocation, navigate to the Settings page of Gravity Forms plugin.
When in the Settings page, click on the Geolocation tab that is on the left column.
The Geolocation tab contains the Settings for Gravity Geolocation add-on. Right now, the only settings that you should see in there is the Google Maps API key input box. If you haven't done so already, you will need to create a new Google Maps API key and enter it in the input box. Then click the Update Settings button to save your changes.