Google Maps problem

When trying to create a map i get this message: "Oops! Something went wrong.
This page didn't load Google Maps correctly. See the JavaScript console for technical details."
I've understood, after reading about this issue, that the problem is related to the api-key that Google requires from all new websites. However i can't find a place to put in an api-key in the plugin settings.
Also this plugin is listed as a Multisite -plugin on the WPMUDEV website but i can't find any network settings. Is this a problem on my install or doesn't network settings exist?