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Changing the ink cartridges, isnt too hard....but you will ave to OPEN the printer.
Open the access door, and there is a Ink Cartridge cover door, that you will need to move/slide open.
Then you must prepare the ink cartridges, by removing any packing or protection tape that is stuck to the ink cartridge, Then you insert the ink cartridegs (thers 4 of them) into the printer.
Close the ink cartridge door.
Then close the printer access door......there is a access door catch lever......you must disengage the door catch lever.
See the images below for the visual aid.
Here is the visual aid to SHOW you exactly what to do.