Each is slightly different
Any manufacturer of a printer makes their printer unique, so you must buy their ink cartridges. Therefore, changing ink cartridges is slightly different for each printer. There are a few common things to look at, but individual printers will vary. Notwithstanding the printer, but you must get to the inside of the printer to change cartridges.
Look for colors
There are usually four cartridges to change: black, magenta, cyan and yellow. To find the cartridges the easiest way is to open the top of the printer and look for a black box. It would sort of look like it could go, but in most cases the four color cartridges should be visible in their colors in the box. They may be hidden a bit in another part of the printer. This means that you may have to look for a button somewhere on the top of the printer to press for about three seconds. This should move the black box out into the open.
Remove ink cartridges from the black box. Sometimes a gentle wiggle to loosen them up for removal while in most cases, you gently pull or push a lever on each cartridge to get them rid of the box. A fore finger and thumb should remove the cartridges from the box. There would be little resistance, but not much.
Keep it clean
Take a look around the inside of the box that held cartridges. If you see some remaining there or possibly on the old cartridge, you must find a non-lining cloth to clean it up to the box. This could clog the ports for the next set of new cartridges.
Install the new cartridges. Each color should go in the same color slot it came out. Place them in the "heel to toe." There should be a "click" to denote they are in place. You are just about done. Close up the unit. You may need to press the same button you pushed before to reset the cartridges. Otherwise, turn on, so it can be reset.