Enable Comments in coupon Theme

Hi ,
I had setup coupon theme on my domain,
But i am unable to ad the following .Please help me.
1) How do i enable comments on website:- https://couponfund.com/
I have enabled comments in WordPress admin -> setting -> Discussion . But it is of no use.
2) When i click on coupon title. The coupon is showing up in pop-up window . I have attached the screenshot of pop-up . But i would like to have the a new page with the coupon details to open instead of the pop-up.
3) If the coupon details opens up in a new page when i click on the title. I can use “ADD this” plugin effectively for sharing on social media.
4) How to add Author info who submitted the coupon on the side bar
5) How to add related coupon functionality on the site

Sorry if the above questions are silly but i am unable to do it.Please help me.
Thanks in advance.