How can you change the Sitle Title Font in a Pre-Designed Wordpress Theme?

Can anyone help :) I just created a Wordpress blog using the Bueno theme. I like pretty much everything about this theme except for the boldness and all caps of the Title. Does anyone know how to change the font style for the Site Title? I don’t know much about CSS and it looks like that is the only place there is a possible way that I could make this change. Thanks ;)