The plugin includes panel where you can preview all available fonts, and get some additional information about each font.
Plugin shows available font weights, and you can preview each weight. And finally, at the bottom you have an example of using the font in CSS and setting family, weight, and style.
Finally, the plugin allows you to directly add the font to the include list so it can be used in the WordPress TinyMCE editor. Top of the page has the include font switch showing the current status of the font for inclusion.