CONTROLLING BACKGROUND ON LATEST POSTS PAGE

Hey Guys,

I have a smaller issue with a new ad system I am trying to implement.

The Page Background AD can either be added directly in the page editor with a short code and works great. See here: http://lucidhive.com/mr-right/2016/11/18/get-your-flannel-on-this-fall/

Since my subsites are showing "Latest Posts" as front page. It doesnt have a page where the short code can be added.

ex. http://lucidhive.com/mr-right/

I would like to run it through short codes ideally as it would be fastest to update.

Yet I also have these two options at my disposal.
1. http://wordpress-advertising.tunasite.com/docs/using-the-asynchronous-js-tag/

2. http://wordpress-advertising.tunasite.com/docs/using-template-tag/

Can I add this someone in the ThemeEditor Customize ?

Or which page is associated with the "latest posts" in the Theme where I could add it trough PHP.

Any Help Much Appreacited!

Thanks
Marcus