Bresponzive Pro font sizes

I’m using BresponZive Pro, and want to change the fonts and font sizes for titles and body of posts.
1. I want to make the post titles to smaller size and different font-family.
2. I want to make the font of the body content of posts to a larger size, and to a different font.

How do I do this?

Sample page is http://www.twoagespilgrims.com/doctrine/the-surprising-origins-of-the-thanksgiving-hymn/.

dvopilgrim