Canon BJC-5100 Series User Manual page 73

Remove the The color BJ tank is on the left; the black BJ tank is on
empty BJ tank. the 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.
Slide the new
BJ tank into
the empty
slot on the
BJ cartridge.
Chapter 4
Maintaining the Printer 4-17