Schritt 3 übersetzen
Use a thumbnail or a pick to separate the clips around the periphery between the black and white plastic parts.
There are 4 clips on the top, 2 on either side, and 5 along the bottom. If you do the sides and top first, the bottom should slide out.
Don't separate the top and bottom immediately, since there are a couple of cables (near the touch pad) that connect between the two.