Hold the computer in your hands and use the tip of your screwdriver or a spudger to push through the bottom right hand hole left by the removed screw. This hole is shown in the picture within a red box.

The tip of the screwdriver will push against the bottom casing of the laptop and pop it away from the rest of the frame.

There will be a loud cracking noise as the bottom of the computer detaches. You are not breaking it!