Where to change slider pictures

Hello, I´m new to this forum. On site www.futureindustries.co I need to change all of the pictures that are on the main page (the slider). Actually there is first slide blank and then 2 pictures. I need to change the first picture (blank) but I have no idea where to find the style sheet or that piece of code where I ľill put the path to the picture. I mean that I have no idea where to find place where I would change this:

background-image: url("");

 

To this:

background-image: url(“path to the image I want”);

 

I´m using theme “Views”

From what I can see your first banner in your Digital Publishing element is empty and thus shows up empty.

Maybe this https://en-community.shopware.com/Digital-Publishing_detail_1891.html can help you fix it.