Turn the laptop upside up and open the lid. You should see 4 small pins located next to the top of the keyboard.

Use an opening pick to press the pins away from the keyboard. A small flat head screwdriver should also do the trick. It's easier to start with the middle clips.

In order to maintain the clips from locking the keyboard again, it's advised to do this with the keyboard in a vertical position or to use another opening pick to lift the keyboard after pressing the first clip.