Thank you for your inquiry. Please follow the steps below:
1. Place the camera, so that the lens of the camera is facing down.
2. Then, open the lid of the camera and pull out the cartridge with the handle on the right side.
3. Insert a new cartridge on and push the cartridge with the handle until you hear the 'click' sound.
4. Lastly, please close the lid.
*Please refer to the video below for more detailed instruction.