De-italicizing freshy 2 header font

I’m just getting started and using the freshy 2 theme. It comes with a bunch of different presets, and I finally settled on one I liked. But I hate the italic font used for the page title, and I want to change it. The problem is, I don’t know a thing about CSS and I tried a few google and forum searches, but haven’t been able to find anything. If anyone can help me find what to edit and show me how, I’d be much appreciative.