1. Prepare your work surface by spreading out the newspapers. Place your tools and supplies on top of the newspaper. Be sure to choose a work surface where you will have ample room. If you must work in a carpeted area, spread the newspapers over the carpet under the work surface, too.
2. Shake the black refill toner container several times. Unscrew the cap and pop open the aluminum safety seal using the screw driver. Screw on the funnel top that came with the refill toner.
3. Locate the rubber stopper on the Xerox toner cartridge. With the hopper cylinder portion of the printer ink cartridge facing up, the small rubber stopper can be found on one of the ends of the printer ink cartridge.
4. Pry the rubber stopper that covers the refill hole off of the cartridge by inserting the flat head screw between the lip of the stopper and the printer ink cartridge. Gently work the screwdriver around the stopper until it becomes loose. Put the stopper to the side.
5. Stand the cartridge on end with the refill hole facing up.
6. Insert the funnel on the refill Xerox toner container into the refill hole on the printer ink cartridge. Slowly empty the toner into the cartridge.
7. Insert the rubber stopper into the Xerox toner cartridge, making sure that it is securely in place.
8. Insert the Xerox toner cartridge back into the Xerox copier. The copier will automatically readjust the toner settings
9. Discard the newspapers carefully avoiding spilling any printer toner which may have spilled. Wash your hands immediately after working with toner powder.

Source:.ehow.com

Once you have the refill kit you will also need a roll of paper towels, clear Scotch tape and some disposable rubber or plastic gloves.

The refill process is as follows:

1. Read the instructions that came with the refill kit and make sure you understand them.

2. It is best to refill the printer ink cartridge when there is still a little printer ink left inside.

3. Put on the gloves and place several sheets of paper towel (folded) on a flat surface. Working over the folded paper towel, remove the printer ink cartridge from the printer.

4. Locate the fill holes on the top of the cartridge. The depressions can be felt by rubbing your finger across the label. Use a sharp pencil to pierce the refill holes in the top of the printer ink cartridge. Squeeze the cartridge to equalize the pressure.

5. Follow the refill kit instructions on which hole to insert each color OR push a toothpick into the holes to identify the ink colors.

6. Pour the ink into the cartridge slowly by inserting the long needle from the refill bottle into the refilling hole. Simply push the needle through the hole and press to the bottom of the cartridge towards the outlet hole. It is important to fill the cartridge slowly and avoid foaming or pushing air into the chamber.

7. Take care not to overfill the cartridge – different printers hold different amounts of ink. See the instructions with your refill kit for how much ink your cartridges can hold. Stop quickly as soon as you see a bit of ink oozing out of the hole. Without letting go of the bottle, slowly release the air, sucking a little ink back out of the ink cartridge, before you remove the needle completely.

8. Carefully daub the cartridge contacts on the paper towel. You should see a splotch of the ink leaking out onto the paper towel.

9. Cover the refill hole with a small piece of clear scotch tape. (This works better than the seal dots included in the kit.) Make sure that no ink is leaking out of the top holes. (That’s where the clear tape comes in handy.) Be careful not to cross contaminate the colors.

10. Any unused printer ink should be put back in the bottle. Clean the syringe with water and dry it properly before filling with another ink color or for future use. If you have several syringes you can label each with a different color so that the same syringe is always used for the same color.

11. When the cartridge has been refilled, check it to make sure it is clean and will not leak into the printer. It is a good idea to blot the print head on the paper towels to make sure the color is not bleeding.

12. Once you place the cartridge back in the printer, print something right away to get the ink flowing. Print a photo with different colors or a test page to make sure every color works. Then run the cleaning cycle 1 to 3 times. If there are any gaps in the printing run the cleaning cycle again, and try removing the Scotch tape from the refill holes.

13. Some printers (like Epson) have cartridges with an indicator chip that tracks how often the cartridge is used and lets the computer know when it may be low or empty. As long as you reset the chip, refilling the cartridge with ink from a refill kit will not be a problem. A resetting tool can be used to reset the memory on the chip.

Source: castleink.com