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look where the paper comes out you will see the cartridge access door. pull it open and you will see the old cartridges. put slight pressure on back end of cartridges and they will unsnap allowing you to pull back and lift them out. To install new cartridges, remove the protective tape being careful not to touch contact surfaces. drop cartridges in and push forward till you hear them click into place. Close access door and you are good to go following prompts from your printer. Hope this helps
Sorry, there was a problem. Please try again later.Thank you for reaching out. HP has a YouTube support channel and you can find a video showing how to change the ink in the DeskJet 4100 here: https://www.youtube.com/watch?v=TSVV4kCYKRY
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