Dell 3110cn Color Laser Printer - Manual (Page 284)

NOTE: Pull the seal out straight. Pulling the seal diagonally may tear it.
Grasp both handles of the print cartridge with the label facing up and slide the cartridge into the same
color slot. Make sure the cartridge is fully inserted. 4.
Remove the orange protective cover of the installed print cartridge and discard. 5.
Close the front cover. 6.