If you’ve purchased a key kit from us, you’ll start with a key, a rubber spring, and a hinge. Start out by opening up your hinge and hooking that wide slot on the hinge over the metal bar on the keyboard. Then take some pliers, or some other tool, and push down on the upper two corners until they snap on. Put the rubber spring in the middle, and then put the key on top. Push down until it snaps on, and then you’re done!
The colors in the video may differ for your model, or the hinge may be rotated from what you see in this video. That’s fine, what matters most is the shape of the hinge piece.