Hi, I'm Nathan.Sorry to hear that you're having trouble with this but I'll do my best to help you.
This is not an automatic process as on some other printers, some menu steps are required prior to physical replacement.
• If an ink cartridge is expended, you see a message on the LCD screen. Note which cartridges need to be replaced, then select Proceed and follow the instructions on the screen.
• If you are replacing a cartridge before you see a message on the LCD screen, press the home (house icon) button and select Setup (wrench icon) > Maintenance > Ink Cartridge Replacement.
Lift up the scanner unit (below the glass)
Open the cartridge cover
Squeeze the tab on the cartridge and lift the cartridge straight up to remove it.
Gently shake the new cartridge four or five times, then remove the cartridge from the package, removing the yellow tape.
Insert the new cartridge into the holder and push it down until it clicks into place.
Close the cartridge cover and push it down until it clicks into place.
Select Check on the LCD screen to make sure the cartridge or cartridges are installed correctly.
Close the scanner unit.
Do you need more help with this?If so, simply reply back on this page.
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