'Click' on the mini picture with the RED frame at the TOP LEFT below. This will enlarge the photo and let you advance to the through the photos (or return) by 'Clicking' the Forward Arrow ' > ' to the Right (or Back Arrow ' < ' to the Left) at the speed you want to view the photos. You can 'Close' the slide viewer by 'Clicking' on the BLACK Cross at the Top Right of the photo frame.