Canon BJ-10sx - Manual (Page 17)

4. Snap off the orange cap from the print head and then
remove the orange tape.
5. Locate the ink cartridge holder on the left side of the
printer.
CAUTION: Avoid touching the yellow mounting base on which
you place the cartridge -- especially the circuit board on the side
of the mounting base and the film cable that extends from the
carriage holder.