Google Map API

The embedded google maps are now asking me to add an API key. I’ve already obtained the key, I just need help locating where to put it.

I need to add the key to the Google Maps script code in the header but I don’t know where to edit it. Please advise.

<script type=’text/javascript’ src=’https://maps.googleapis.com/maps/api/js?v=3.23′></script&gt;

Thanks