Here's How To Change Ink In Canon Printer. For doing this, follow the provided steps. Firstly, open the cover that protects the ink cartridges. Further, press the release button for the ink cartridge that needs to be replaced. Now, take out the old ink cartridge and replace it with the new one within the carriage of the printer. Additionally, maintain pressure on the ink cartridge until you hear it click into position. Lastly, put the cover back on the ink cartridge.