How do I add an edge web font to a style sheet?

I am a complete beginner, trying to teach myself DreamWeaver by using the getting started turorials. In tutorial 3, item number 4, I am supposed to copy the css font code from the edge web site and paste it into the sample css sheet I created in tutorial 2. The copying bit is easy but I don't have a clue where to paste it and the tutorial doesn't have any image to show me where it should go. Can someone please help?