Turn off the printer and unplug it
Remove the ink cartridge from the printer
Locate the refill hole or ink inlet on the cartridge
Wear gloves and protect the work area with paper towels
Use the correct ink type for your cartridge model
Draw ink into a syringe or refill bottle
Slowly inject the ink into the cartridge through the refill hole
Stop filling when the cartridge is near full and do not overfill
Wipe off any excess ink from the cartridge
Seal the refill hole if required
Reinstall the cartridge into the printer
Run a test print and clean the printhead if needed