You can also hook it up through hdmi cables. Thats how mines attached.
How Do I Hook Up My Dell Laptop To My Lg Plasma Screen Tv?
The monitor must have come with cables and connectors and the laptop will have a port (socket) at the back or on the side of the unit for monitor connection. If your monitor's connection is larger you'll have to purchase a new one but it's really as simple as plugging in and tightening the screws.