When you need to change the ink cartridge on your computer printer, the first step is locating the cartridge. This can be tricky, since different models are configured differently. Even if you don't have the manual handy, you can find the ink cartridge on your Canon PIXMA MP480 printer fairly quickly.
Make sure the printer is plugged in and turned on.
Grasp the front top of the printer. This is the Scanning Unit Cover.
Lift the Scanning Unit Cover gently until you hear a click. The cover will remain open by itself.
Wait while the cartridge holder moves from the left to the centre of the printer. The ink cartridges are located in the cartridge holder.