Open an image then tap the slideshow icon. If you want to change the slideshow settings tap the image actions menu and select "Slideshow Settings".
You can create and save Slideshows in two ways:
If you can't see "Create Slideshow" you may need to Enable "Slideshows". Tap the Cog icon on the home screen and select "Admin Settings" - > "Feature Switches" and toggle on "Show Slideshow Location".
If you lock a slideshow you cannot exit the slideshow without entering your admin password. Simply toggle the switch in "Slideshow Settings". Great for Showing customers images without giving them access to all the files on your servers or iPad.
You need to have enabled an Admin Password to use this setting.