Step 2: Remove the keys
Once you have the square keys removed, your keyboard should look like the 3rd picture. At this point, remove all keys except the space bar, keeping in mind that they will have rocker bars that may need to be gently pushed out with a driver or lonely mismatched chopstick.
Finally, remove the spacebar. In the 4th picture you'll see a little plastic spring molded into the piece. With a driver, pull that one way and then the other, freeing the retaining post on either side as you go. Click on the picture for details. Then pry the spacebar out from the bottom, in the middle of the bar.