How do you remove ink cartridge of HP F4280

The cartridge door is to the right of the paper tray. It is hinged like a regular door...open it to the right.

The cartridge carrier should move to the right to access them.

To remove the old ones, press down slightly on the rear of the cartridge and tilt it out. To insert the new one, angle it upward slightly at first then apply pressure down in the front and up on the rear until it clicks into place.

Here is a link to the Setup Guide if it would help.

F4280 Setup Guide