Here we have the keyboard. It, too, must be removed. The arrows point to the five retaining clips that keep the keyboard locked in place.

Second picture shows a closeup of the retaining clip, with an arrow indicating the clip itself. Push this back using a small flathead screwdriver, while using another to gently pry the keyboard up from the top cover. DO NOT PRY TOO HARD. This will result in a bent keyboard, requiring an expensive replacement.