Dell P703w - Photo All-in-One Printer Color Inkjet User Manual page 33

The printhead moves to a center position. The ink tanks are located in the printhead.
Number Part
1 Printhead
2 Color ink cartridge
3 Black ink cartridge
3. Wait until the printhead is idle and silent, then pinch the pinch latch on the old ink cartridge with your thumb and forefinger.
4. Lift it out of the printhead.
5. Remove the bagged ink cartridge from the box, tear open the bag at the notch, and remove the ink cartridge.
6. Remove the orange cap from the cartridge by grasping the top edge and pulling/rotating it off the ink cartridge.