How To add Google API Key to Google Map?

Google Map has a new rule to use API key in their Google Map, You can add your API Key to your page like this:

Please find Google Map Script line in Footer of page:

<script type="text/javascript" src="http://maps.google.com/maps/api/js"></script>

Add you API Key to end of JS file URL like this:

<script type="text/javascript" src="http://maps.google.com/maps/api/js?key=YOURAPIKEYHERE"></script>