Hi, I'm Nathan.Sorry to hear that you're having trouble with this but I'll do my best to help you.
The ink cartridges are inside the printer.
The upper portion of the printer, below the scanner lid/glass, but above the display screen, will lift up (hinged at the back) and there is the printhead/carriage inside off to the right. When you raise that inner lid it becomes accessible to change the cartridges.
There is a video here that will guide you through the process as well: http://bit.ly/2dIlKQ4
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