How can I rearrange images in a slideshow?

First, hover over the slideshow to display the toolbar.

 

 

Next, click the 'Image' button in the element toolbar.

 

 

In the 'Add New File' modal, find the photos in the 'Successfully Uploaded / Chosen Photos' section. These are the photos in the slideshow element.

 

 

To rearrange them: simply click, hold, and drag the images into its correct spot.