Bresponzive Pro font size

I'm using BresponZive Theme, 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.

 

For your information, BresponZive Theme is not our product, kindly contact the correct theme author.