Obviously you need fuel. Open the lighter and remove the INSIDE UNIT from the CASE. Flip it over and you'll see the FELT PAD. On recent models there will be a pinched hole in the felt. If so, simply insert the fluid can into the hole and squirt the fluid right into the packing material in the FUEL CHAMBER. Three generous squirts will usually do the trick. Fill slowly, taking care to never overfill. Avoid getting the lighter fluid on your skin as it can be a skin irritant. If contact with skin does occur, wash the effected area with soap and water. If you don't have the refill hole lift the corner of the FELT PAD on the bottom of the insert to reveal the packing material in the FUEL CHAMBER and then squirt the fluid right into it. Insert the inside unit back into the CASE, making sure to wipe the lighter and your hands dry before igniting. Be sure the fuel can is closed and that there is no spilled fuel in the vicinity before igniting. This is a flammable fluid.

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Incorrect, gentleman; sorry, but you both flunked elementary ZIPPO lighter maintenance. That IS a refill hole and not a place to "store an extra flint". Might I suggest both of you read a bit more thoroughly over on the ZIPPO web-site?

how stupid can people get? you honestly think thats how to fill a zippo?

That's not actually a refill hole, it's there to store a flint in.