Simple Catch Theme: Changing Heading Size (front page and every other page)

Dear Team, Thanks for providing update to Simple Catch theme, specially big thanks for responsive website support. I got an issue, after update I am not able to change the font of Heading in front page (www.gisresources.com) and every other page related to the post (I assume, both the headings share same font size). I tried to refer support pages, and tested some solutions, but couldn't succeed. Kindly help me to provide appropriate solution. One more thing I am not a developer, so please make your help easy for me. Thanks Saurabh Singh