With all screws removed (and safely put aside), you may begin removing the cover. A plastic flat object can help doing this. Note that more force will be required than you might expect

Start by pulling up on the lip, highlighted in Red. This will be at the back of the computer.

Once the back has been lifted up, begin lifting up at the orange side on the left. This will be right next to the back we just pulled up. The right side should come loose at this time; pull up on it as well

Lift and pull on the yellow edge, on the opposite side of the first part we pulled up on. Once this is removed, lift the panel off the computer.

In the steps, the colors mentioned to pull on align with the colors shown on the image. "Pull on the yellow edge" means to pull on the edge marked in yellow on the image