How to reduce space of left, right and top of JustRead theme

Hi I’m naive here as well as designing WordPress pages. I want to remove the space which are left at left side, top ( Where Core Java Theory written) and also to right. Because I want to use those spaces for advertising adsense. How can I do that? If can i post add on that spaces? if yes then i guess no need to remove that space since it’ll be used for ads. but I think ads look good only on one side not two.

I also wanted to add list of topics as sidebard at left side how to add sidebard at leaft side where i can show list of topics so when user clicks on that new page appear.

The page I need help with: [log in to see the link]