Make sure the laptop is powered off before starting. Remove the battery.

Use a plastic opening tool to pry out the narrow plastic lid.

You may use a flat-head screwdriver for this task, but will most likely scratch the keyboard and the plastic lid itself.

Exercise caution when re-assembling: carefully and gently snap the lid back on. The plastic lid may easily break since it is made of a thin and soft plastic material.

Before replacing the lid, you may want to power on the laptop and test that the keyboard is working properly.