How to change layout of list-style?

Thanks in advance for helping me, always challenge for a newbie. Could you give me some direction on how I can customize the list boxes in coupon theme pages? The screenshot is what I have now, basically, I want to increase size of thumbnail, include more post content, make view-deal box smaller and remove comments.

I have some experience with wordpress, but when I start premiumpress themes, I am lost. Great themes but I think I need get familiar with it.

Thanks!