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Open the top cover of printer and the print head with ink tanks will move to a position where you can take out the inks. Push the lever like thing on the ink cartridge and pull it out. Install new ink. See this article --> https://support.usa.canon.com/kb/index?page=content&id=ART140208
If you have any questions or if you have any difficulty, please let me know. Please let me know whether you are able to replace it or not. Looking forward to your reply.
Hi there, I'm just checking. How is it going ? Were you able to replace the cartridge ?