If you do not have a user manual for this printer then download one from this site. It should explain which ink cartridges types to buy and how to replace these. There are only two cartridges but based on the size you can buy different.
HP 662 Black Ink Cartridge (~120 pages);
HP 662 Tri-color Ink Cartridge (~100pages);
HP 662XL Black Ink Cartridge (~360 pages);
HP 662XL Tri-color Ink(~330 pages)
http://h10032.www1.hp.com/ctg/Manual/c03847745.pdf
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