Gently pull the rear shell off the main body of the camera.

The shell should slide off easily. If it doesn't, check to see if any clips re‑engaged and use your opening pick to release them.

During reassembly:

Press the shell firmly onto the main body so all the clips engage.

You should feel and hear distinct "clicks" as the clips engage.

Check around the shell seam and make sure there are no gaps. If there are, firmly press the shells together to engage the clip near the gap.