Canon BJC-4400 Series User Manual page 73

Remove the The color BJ tank is on the left; the black BJ tank is on the
empty BJ tank. right.
Grasp the tab on the top of the tank and pull forward to
release the BJ tank.
Then lift the BJ tank up and out of the BJ cartridge unit.
Dispose of the BJ tank properly. You may want to place it
in a plastic bag to keep from spilling any residual ink.
Take the new Then remove the protective cap.
BJ tank out of its
packaging.
Chapter 4
Maintaining the Printer 4-19