Gently pull the red and black wires, lifting the white connector upwards, out of its position. (You may need to jiggle the wires from side to side somewhat to loosen the connector.)

Now that all cables and screws are disconnected, you can now remove the flash assembly.

To reinsert, line up connector with the copper leads on the camera, and gently press the white piece into place.

The black cable should be closer to the top of the camera.