[Theme: Heat] Adding Slides to a full width Slider

For some reason my Home page does not display the photos I added to the Slider. When I log on now it says: “no slides found, please add some slides.”

For the life of me I can’t find where to do this. I assume its under ” Add Media” but can’t seem to get it to work.

Website is: https://keithjbaintonphotography.com

Any advice would be gratefully received!