Slide your opening pick around the bottom right corner and up the right edge of the lower case.

If your pick gets stuck at the cutout, use your fingers to lift the lower case up slightly to allow your pick to slide underneath.

Slide your pick until it reaches the middle of the cutout, or until the rightmost clip stops it from sliding.

Twist your pick to release the two right clips.

You'll hear and feel a pop when each of the two clips releases.