Change Background Image on Post Page

Hello, I just downloaded this theme and I have pretty much figured out everything. However....I do not really like how my "Blog" page is displaying. It is slightly hard to read with the background image. I was wondering if there was a way to either: #1 remove the imgage on this page only so the white lettering can be against a solid color making it easier to read? Or #2 Some how darken the image so the white stands out more and is easier on the eyes? I love my background image and want to keep it throughout the website, however it is just the Blog Page I need tweaked. If this requires some sort of CSS code or whatever, please explain it to me like I am a 5 year old....coding is not in my skill set. http://www.michiganjason.com