How do I replace an ink cartridge in the HP Deskjet 1050?
Open the cartridge door and wait for the cartridge carriage to move to the center, then press down to release the cartridge and remove it. Remove the new cartridge from its packaging, pull the pink tab to remove the plastic tape, insert the cartridge into the slot until it clicks into place, and close the cartridge door. Calibrate the cartridges after installation. (Pages 28–30)
From the official HP Deskjet 1050 All-in-One Printer Series J4 manual, page 28
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