Canon printers make it simple and easy to change ink cartridges. Most of its line of printers are very similar in the way ink cartridges are replaced, but if you run into problems, refer to the users' manual or the Canon website download library for instructions specific to your printer.
Protect your desk, printer stand or work surface by placing an old newspaper in front of or next to the printer. The newspaper will provide you with a place to work without getting ink anywhere you don't want it. It seems as though no matter how careful or neat you are, a little bit of ink always manages to escape when replacing an ink cartridge.
Prepare the new ink cartridge for installation. Remove the replacement cartridge for your Canon printer from all of its packaging. You may need scissors to remove the heavy wrapper. Leave the protective orange cap or tape in place for now. Set the new cartridge aside on the newspaper.
Remove the old ink cartridge from the Canon printer. With the printer on, open the front door or panel of the printer. Wait a second or two and the ink cartridge holder should move to the opening where it is accessible. If it does not move, shut the door, turn the printer off for a moment, turn it back on and try again. Lift the small lever that secures the ink cartridges within their holder. On most Canon printers, it is coloured green and located on the right side of the ink cartridge holder. Gently lift the old ink cartridge out of the printer.
Place the new ink cartridge in the printer. Remove the plastic cap or tape protecting the ink cartridge, being careful not to touch the black and gold "sensor" area of the cartridge. Gently but firmly push the new cartridge into the empty slot left where you removed the old ink cartridge. The label should be facing outward. You should feel the cartridge pop into place. Then push the lever back down that you lifted in Step 3. Close the printer door. Use paper towel or wet wipes to clean any ink from your hands.
If you don't plan on reusing the old ink cartridge, consider donating it. Many charitable organisations collect used ink cartridges and earn money by recycling them. Contact your favourite charity to find a nearby drop box.