It’s cheaper if we buy refill ink than the original one. If you want to fill ink into HP 704 cartridge for HP Deskjet ink advantage 2060, you must know the correct hole for each color.
You have to open the sticker, and fill the whole with the right color as the picture above. Magenta or Red is on Top. Yellow is on the left, and Cyan or Blue is on the right.
After you fill the ink, clean the cartridge with tissue. There should be no ink covering the chip. Then you should cover the holes with the sticker. If it’s damaged, you could replace it with paper and cellophane tape.