How can you change the Site Title Font in a Pre-Designed WordPress Theme?

Can anyone help πŸ™‚ 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 πŸ˜‰