if you have stater cartridge ( the cartridge that came with the printer Which is don't have a refill hole) please check the link below for the video instruction

https://www.youtube.com/watch?v=UgvKBFdkI2g

Or if you have a regular cartridge which is have refill hole, check the website below for the video instruction

https://www.youtube.com/watch?v=RSwS5OLVkxE