Google Maps has stopped working on one of my sites ("This page can't load Google Maps correctly"). By looking around a bit, it seems like this might be related to a requirement to have an API Key (this is an older site (5.7.4.2) and hosted by PortlandLabs).

I can't seem to find a way to update the block to include an API key—or find out where I'm supposed to do that. Can anyone point me in the right direction? Thank you very much in advance.