Visit The Google Font Page and search for your Font (Screenshot)
Click on Quick Use and look at the Select Tab. Add this code to your Google Font Settings Field (The google font families to load).
Click on "Add New" to add unlimited fonts to the Slider.
To integrate the font, copy the font-family settings from Google Font page and edit a Style, open the advanced tab and put it into there. For further details look at the CSS Editor part later on.