Plug the monitor into the laptop. Easy as plugging in a lamp. Let's hope the port isn't damaged, too.
However, some laptops will not begin using an external display unless you set it to from the advanced display properties (in Windows), in which case the laptop's monitor needs to be at least somewhat usable in order to use the second one.
Answer
I would suggest to replace the whole LCD screen. I bought the LCD from ScreenCountry and completed the rebuild, booted the machine up, and everything worked absolutely perfectly. That's a better solution than connecting a bulky external monitory into a portable device.
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Most laptops will have an external monitor port - A 15-pin socket shaped like a trapezoid. There will usually be a tiny picture of a monitor next to it. You simply need an appropriate lead to plug into that socket - with the correct connector at the other end for your external monitor.
Laptops are usually configured to transfer the image from the internal screen to the external monitor once it's detected. If not - Pressing the Fn key and F5 together will toggle the display.
You need a VGA cable to connect a laptop with a damaged screen to an external screen. The laptop in question must have a VGA slot.