The Image Slider widget shows your photos one at a time and moves to the next on its own, with an optional caption and link on each photo. Drag Image Slider from the Widgets tab onto your page, then add your photos in Inspector > Widget Settings.
For step-by-step instructions, and to compare it with the Carousel, Slide Show Fill and galleries, see Add a slideshow to your website: Image Slider, Carousel, Slide Show Fill or a gallery.