First, you'd better find out instructions and read it, follow the instructions. According to the specifications, insert the cutting edge into joints of cover cartridges and ink cartridges, and slowly push it in, the cartridge can be open. After you open it, yiou can see there are 3 case for 3 colors, each case has 3 holes, you can add ink in anyone of it. Add HP ink into the ink injected respectively by color, do not exceed the capacity of the sponge. Then replace the cover, cover and fix it with strip. Wipe the head with a paper, if the ink cartridge can flow pack to return, it would be ok. But if the leakage is not smooth, maybe the head is a little dry after running out of the ink cartridges. You can resolve it by immersing the nozzle.
Reproduced please specify: Ink and Toner Cartridges|Inkoffice