Another way to refill Copic ink is to use your Copic tweezer and wiggle one of the nibs out. Don't forget to put paper underneath.

Now that your done with that, grab your refill color.

Our the ink in through the hole. I actually find this way messier than the first way x3.

Put the nib back on and your finished.

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Now for the third way ...

Use the broad side of your Copic. Make sure both sides are open. ( brush and broad )

Get your booster needle and place it onto you refill. The needle slips past the hole on your broad side. Start refilling your Copic and your done.

( I don't have the booster needle so I had to take the image of online. So credit for the image goes to the Internet XD )