Canon HC-4200 User Manual page 63

{ The color ink tank is on the left; the black ink tank is on the right.
{ Grasp the tab on the top of the tank and pull forward to release the ink
tank.
{ Then lift the ink tank up and out of the BJ cartridge unit.
{ Dispose of the ink tank properly. You may want to place it in a plastic
bag to keep from spilling any residual ink.

{ Then remove the protective cap.