Canon BJC-6000 Series Setup Instructions page 8

5. Insert the Ink Tank.
Insert the BCI-3BK (Black) Ink Tank into the slot in the BJ cartridge.
Gently press down on the top of the Ink Tank until it locks into place.
6. Close the front cover.
After you close the front cover, you will hear the cartridge holder return to the home position.
The printer automatically cleans the print heads.