The guide can work on the most of laptop keyboards, in this case, the real one is Asus G51/G71 keyboard.
1. Just slide a thin object (fingernail is ok) underneath the spacebar and pry it off. It will make a popping sound as you separate it from the keyboard, but it is made to come up very easily.
2. Under the spacebar is a thin metal bar that slides underneath one hook on each side. Make sure the metal bar is hooked on both sides.
3. When the metal bar is hooked in place, simply lower the spacebar down and press on both ends until you hear it snap and it doesn't come up anymore.