Using guitar picks or some opening pics, slowly and carefully slide one between the 2 layers of the laptop. There is the bottom cover which curves to the top and then the palm rest which meets it at the very edge. I recommend slowly and carefully sliding a pic between then where the palm rest dips under the trackpad, marked with a red rectangle

Be carful to not go to deep and be aware of the ports on the laptop. Eventually, you will be able to open the laptop once you separate enough of the bottom cover from the palm rest.