Canon MG8100 series On-Screen Manual page 111

Do not push the sides of the ink tank. If you push the sides of the ink tank with the L-shape
air hole (C) blocked, ink may splash.
Do not touch the inside of the orange protective cap (D) or the open ink port (E). The ink
may stain your hands if you touch them.
Do not reattach the protective cap (D) once you have removed it. Discard it according to
the local laws and regulations regarding disposal of consumables.
5.
Install the new ink tank.
Insert the front end of ink tank into the Print Head at a slant.
(1)
Make sure that the position of the ink tank matches the label.
(2) Press the mark
place.
Make sure that the ink lamp lights up red.
Important
You cannot print if the ink tank is installed in the wrong position. Be sure to install the ink tank in
the correct position according to the label on the Print Head Holder.
You cannot print unless all the ink tanks are installed. Be sure to install all the ink tanks.
6.
Close the Scanning Unit (Cover) gently.
Caution
Be sure to hold the Scanning Unit (Cover) firmly using both hands, and be careful not to get
your fingers caught.
Important
When opening or closing the Scanning Unit (Cover), do not touch the buttons on the Operation
Panel. Doing so may result in an unexpected operation.
Note
If the error message appears after the Scanning Unit (Cover) is closed, refer to "
Troubleshooting " in the on-screen manual: Advanced Guide
(Push) on the ink tank until the ink tank snaps firmly into
.