Dell P703w All In One Photo Printer User Manual page 38

2. Slide the photo tray towards you until it stops.
NOTE: When the photo tray is disengaged, the main paper tray is active.
3. Insert the stack of photo paper into the photo tray, print side down.
4. Slide the photo tray with the stack of photo paper in until it stops.
NOTE: Engaging the photo tray turns the photo tray light on.
5. Close the photo tray lid.