Google Fonts Developer API Key
Because the Font Manager taps into the Google Font API in order to get access to all the Google fonts, you’ll need to get a Google Fonts Developer API Key when using the Genesis Design Pro - Google Web Fonts add-on.
In Design Palette under Settings there is a direct link to the Google Developer API page.
On the Google Developer API site, find the button that says Get A Key. It will ask you to name your project, and this can be anything you want. After you name your project, a pop-up will have your Google API key. Copy the key and add it to the Google Fonts API Key box back in Design Palette Pro.