Edit Fonts

You can use CSS in a child theme or a CSS plugin (like Jetpack) to do this. I recommend using Firebug for CSS work–makes it much easier.

You’d want to add a font to your site using the @font-face property, or use a service like Google Web Fonts, then change any font-family properties found in the theme’s style.css by copying and changing their rules in your child theme’s style.css or Custom CSS plugin.