I have a Nikon Digital camera and want to use it as a webcam?

How do I do this? I read an article about any digital camera working as a webcam but i'm not exactly sure how to do this… Any suggestions

You have to use a special video capture cable to connect it to your computer to use it as a webcam.

Can this camera be used as a webcam?

The quick answer to this VERY common question is "No".

The more detailed answer is this: yes, sometimes it is possible, but it just isn't a good solution!
You would need to have the right camera, cable, software and drivers.
Then you need to set it all up to work, which can be a big pain.
Even if you DO get it working, you are now causing wear and tear on what might be a fairly/very expensive camera.
Webcams start at about $20.oo. They do the job well, they are usually easy to set up, and they can STAY set up - you won't want to quickly grab your webcam on the way out the door, only so you have to start setting up all over again next time you want to use it.

Check out the websites of Logitech, Creative, and Microsoft.
All make good webcams.
Check the features carefully if you want to have those fancy video effects, because not every cam supports them.
Figure out which models you like, then google for the best price.

If you are still determined to use your still camera, then read your manual - if it is possible, it would be a good selling point (even though it makes little sense), so the manual will tell you how to do it.

If you did a quick search here on YA, you would find MANY instant answers to this.