Continuing clockwise, separate the top right corner of the frame.

Skip past the hole where the combination Sim and SD/TF Cards go, and insert your pick on the other side of the hole.

Skip past the orange button and insert your pick further down the frame, to finish separating the right side of the frame.

Although this button should remain in the front half of the frame, it could come out partially or fully during disassembly. Make sure this button is present and secure before reassembly.