How do I properly install a toner cartridge in the MF1538C?

First, shake the toner cartridge 5 to 6 times to evenly distribute toner inside, without removing the Drum Protective Cover. Then align the cartridge with the Toner Cartridge Guide and push it into the slot marked with the appropriate color label until it stops. Do not touch the drum surface, electric contact points, or the Toner Cartridge Memory during installation.