How do you fill empty

Hi, depends on the make of the cartridge but generally there are refill kits available for the more popular makes (HP Canon Epson etc).
The kit contains a syringe with a long needle that you push into the empty cart (normally in the top). This can be a messy job so best to put plenty of old newspaper down before you start.

You don't say where abouts you are but if you google "ink cartridge refill kits" you will find plenty of choice to buy online.

Hope this helps.

i use to have a refill, there not worth it real messy

if u want a working printer which would last for a long time ... do not refill a cartrige coz the kind of ink used in the refill and the ink used by the company are of different quality .,.. the ink in the original printer doesnt harm the head of the printer but the refill ink just makes a coat on the printer head and damages the printer head the original cartriges are no doubt expensive but ur printer is worth