If you have more than one device, you have to select the device that you want to configure.
Under “Use This Device for Calls” select the device you want to configure.
NOTE: Depending on the device, not all options can be configured. If you select your Desk Phone you obviously cannot configure add a camera as it does not have one.
If you select Browser, your Camera, Microphone, and Speakers must be installed and configured on your Computer or Laptop to be selectable.