Simply select Image Carousel from the options on the right side of the site. You will then have the options to import or select (at least 2 images). You can search the web, your albums, or Google Drive. Once chosen you will see a settings gear which will allow you to choose whether you want your viewers to see dots (to know there are more images) as well as to Auto Start the carousel.
Embedded below is a 1 minute and 10 second YouTube tutorial.