How do I change the toner cartridge on the HP Laserjet Pro 400 MFP M425?

Open the toner cartridge door, remove the old cartridge, and place it in the bag from the new cartridge for recycling. Gently rock the new cartridge to distribute the toner, remove the tape tab, align the cartridge with the tracks inside the product, and insert it until firmly seated before closing the door. Do not touch the shutter or the surface of the roller during this process. (Pages 4-5)