To edit the sample Google map on the Contacts page, please follow the steps below:
First of all it isn't an image, but an Embed Map. In the VIP Restaurant Wordpress Theme we use Google Maps Easy plugin. You can read more about this plugin here: Guide to Google Maps Easy Plugin in VIP Restaurant Wordpress Theme
Please go to Dashboard > Google Maps Easy > Add Map and make the map for the location, following this guide: Guide to Google Maps Easy Plugin in VIP Restaurant Wordpress Theme
Then copy the map shortcode:
Please add the map shortcode to the Header Featured Area field. Turn ON the Full-Width Header Featured Area
Please hit the "Update" button in the top right corner of the page to save the changes.