Thank you for your help I followed those step:
Create a slideshow. In Shared, select an album or Photo Stream in My Albums, then select Play Slideshow. Select the slideshow settings you want, then select Start Slideshow.
Set slideshow settings. Before you start the slideshow, you can adjust the following settings:
- Shuffle Photos: Turn on to show your photos in random order.
- Repeat Photos: Turn on to play the slideshow continuously.
- Theme: Select a slideshow theme to apply a different style to your slideshow.
- Time Per Slide: Select how long to display each photo on the screen.
- Transition: Select the transition effect used between photos.