Having problem with updating home page slider

We have a slideshow on our home page with four pictures. We are trying to switch out one of the pictures on the slideshow. The problem is, I don’t know how to get to the slideshow to make the changes. If I try to edit the home page, I can’t find anywhere on the page how to access the slider. On our slideshows page, we have several slideshows but none of them are for the pictures on the home page. (We use the Slideshows plugin.) Can anyone help?

The page I need help with: [log in to see the link]