If you have a USB camera, then any free USB port should do. If you camera is not working, you may want to download and install the latest drivers for your camera. If you don't know how to get those, post the model of the camera and I can try to find them for you. There is always a possibility that your camera will have issues with the latest release of Skype, if that is the case, you may have to downgrade a release or so. Prior to doing that, you need to make sure you camera is installed and seen by your Operating System.