How do I change Google Map API Key for website?

Beginning July 2018, Google has changed its policy of using the Google Map API Key, which is beyond our control: https://cloud.google.com/maps-platform/pricing/sheet/

1, When your Google map is no longer working: http://prntscr.com/k8qosr
2, Create your Gmap API key here: https://developers.google.com/maps/documentation/javascript/get-api-key
3, Login to your website admin page -> theme option to add a Google API key for your website.

3a, For theme option: Theme-name Options -> Miscellaneous Settings : http://prntscr.com/k8qpqe

3b, For customizer: Appearance -> Customize -> Miscellaneous: http://prntscr.com/k8qu61