Google Map API Upfront Builder vs Google Map Plugin

I've spend all morning trying to accomplish what I would consider a simple implementation.
About to just to head over to https://developers.google.com/maps/ and just hard code what I need into the theme.

I've tried and looked around but I cannot add my map locations either with the built-in Google Map API in Upfront and the Google Map Plugin. I've de-activate the google map plugin at the moment. Only have Upfront Builder activated.

How do I add my locations?
When I try to drag the map it asks to:
Please enter your Google Maps API Key in the field here.
Above that it says:
Please Enter Address:
I've added the API key but where do I add the addresses?.

Thanks,
techhelpstew