The keyboard is attached by three cables. Be careful not to lift the cover too far so you do not damage these cables.

Using tweezers, unplug the three cables attached to the keyboard. To do so you will find where the wires end (the three red marks). Use tweezers or your fingers to pinch the plastic piece holding the wires, and gently pull the piece out. After that it should disconnect.

Lift up the plastic keyboard cover.