Press the front-door-release button.

Open the front door.

Remove the used toner cartridge from the printer.

Remove the new toner cartridge package from the box, and then pull the release tab on the packaging.

Remove the toner cartridge from the opened packaging shell. Place the used toner cartridge in the shell for recycling.

Align the toner cartridge with the tracks inside the printer, and install the toner cartridge until it is firmly seated.

Close the front door.