How can I make my printer (Epson XP-225) print an image using only the yellow ink?
(All other ink cartridges are empty, only yellow cartridge has ink in it. I want to do this without editing the actual image itself)
No, you can't. In fact, even if you edited the image so that the CMYK values were zero for everything but the Y channel the printer would still refuse to print. Go buy the other inks.