If your box has LEDs, slowly tilt the edge of the case away, revealing the ribbon cable connected to the board.

Lift the lock in the direction of the ribbon cable, and you should feel the ribbon cable release.

You may now remove the ribbon cable from the board, and place the lid aside.

During reassembly, note that the ribbon cable contacts should face opposite the lock slider (as in photo). To re-insert the ribbon cable, first release the lock, insert the cable, then press the lock back down to latch it in place.