7.Tilt the new cartridge toward you slightly as you insert it. Lower the cartridge so that the tabs rest on the hooks.
Tabs
Hooks
Caution: Don’t place the cartridge tabs under the hooks on the holder clamp; you may damage the clamp when you close it.
8.Press down firmly on the ink cartridge clamp until it snaps into place.
9.If you need to replace the other ink cartridge, repeat steps 4 through 8 before continuing with step 10.
10.Press the ink cartridge replacement button and close the printer cover. The printer moves the print head and begins charging the ink delivery system.
Make sure the cartridge tabs are positioned above the hooks 
The P power light flashes, and the printer makes noise. Charging takes about one minute. When it’s finished, the P power light stops flashing and stays on.
Caution: Never turn off the printer while the P power light is flashing, unless the printer hasn’t moved or made noise for more than 5 minutes.
42 Maintaining Your Printer