Customizing Jetpack Carousel lightbox

I am wanting to do the following to the carousel lightbox:

– Remove the “comment” link on the right in the lighter gray box. (I still would like to keep the comments box below) AND
– Replace the comment link on the right with a “Buy Now” link that takes you to my woo commerce product page for that image. Not sure where I would be able to enter this unique url for each image. Seems a lot more involved.

– If the above Buy Now option with a custom url is not possible, I would like to put a link or an image in that area that goes to my store page.

– Remove “view full size” option under comment link.

– add social options for each image

http://exposurescape.com/grid-test/

Is there a place where I can view options on how to customize things with this?

And what actual file would I edit to make changes?

Thanks!