Wordpress Geocoding Using Direction Or A Map

I'm trying to make a Wordpress page where the user can point to a location by writing the adress or browsing a map`. As you can see in the page (http://www.levinor.es/pruebas/pagin

Solution 1:

Google has disabled the use pt the Maps API for this application. The key you used is not valid or is not authorized for Google maps JavaScript API.

If you obtained this key you still need to enable the use of the JavaScript API

Go to this link for more info:

https://developers.google.com/maps/documentation/javascript/tutorial