Your MapPress is a little out of a date, so as a first step please upgrade to the latest version.
Lat/lng entry should work in both Leaflet (Algolia) and Google. But what you describe sounds more general, i.e. Google won’t parse ‘Florida’.
If your API key is invalid, or the key doesn’t have the correct libraries activates, please see the MapPress FAQ. There’s a link there that will create a key for you with the correct libraries enabled, as well as some troubleshooting information.
If the above doesn’t help, please use the contact form to send the URL of the page you’re editing, and a login to the blog (so I can see the map editor in the back end).