How do i use my digital camera as a webcam?

you can do this only when your Camera has the webcam option.

if you are sure it has this option, (Sometimes) there must be a webcam driver included in your camera CD.

There is an option in your camera menu to be turn on to use this webcam option.

Start by attaching your camara to your usb cord that cam with your Digital camara to your computer and then open up your webcam then you should see yourself on cam. If not check the resource that your pc is recieving your connection from your camara. If you need help Contact me at the below link.