To assemble, just push the ball into the socket until you hear a click. To separate the links, push and twist the ball against the socket.
Once the chain is assembled to the desired length, it can be opened for filling with cables and hoses. To open, push the crossbar tip upwards and swing it open. As you can see, there are three compartments to hold the media. To close, push the crossbar inwards until it clicks into place.