You need to lever down so that the spring in the pin compresses: the strap detaches. Insert the tool between the strap's attachment points and the strap. To do this, you need to release the pins connecting the strap to the Keymaze casing. Using the tool supplied, remove the strap. i The strap and tool may differ slightly depending on the date when you buy your Keymaze.The metal cable guide pin must be able to slide freely into the hole to the bottom-right of the socket. When plugging in the cable, be sure to turn the connector round the right way.