How do I change the Front page slider images?

I installed the theme and the default Slider images from the Preview are now showing on my Front page. Where are those specific Slider images being specified? For example, how can I swap just one of the default Slider images for an image from my Media Library? The documentation mentions Featured Content and Featured Images, but when I edit my front page and/or my posts, I don't see where the default Slider images are specified.