That cable is 1.8 metres long and it has a HDD 15 pin male connection at each end.
So it connects to the video card output on the laptop and to the input on the monitor.
You will then need to set the laptop to display on the monitor instead f the laptop screen, that should be set in the control panel, display I would assume.
I assume that you have those connections (15 pin female for the male plugs to go into) on the monitor and the laptop?
Arnak