How do I refill the ink tanks on the HP Smart Tank 7600?

To refill the ink tanks, open the ink access door to access the four ink tanks, each containing a different colored ink: black, yellow, magenta, and cyan. Follow the refill instructions outlined in the manual under the 'To refill ink tanks' section to avoid spills or overfilling. You can check estimated ink levels beforehand from the printer control panel by going to Menu or from the HP printer software on Windows. (Page 77-78)