How do I install ink cartridges on my HP Photosmart C4600?
Open the cartridge door, remove any tape from the cartridges and ensure they are held with the 'HP' logo facing up. Insert the tri-color cartridge in the left slot and black ink cartridge in the right slot, then press OK.
From the official HP Photosmart C4600 All-in-One Printer manual, page 4
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