Device List: this shows the list of all available capture devices
Capture Interface: select one of the available Capture Interfaces
Number: select the number for the camera - Experts only
Add from folder:select a previously stored configuration from any folder - Experts
ReRead Devices: if you plugged a USB interface and it's not showing up in this list, hit ReRead Devices to update the list
Cancel: aborts this selection form
OK: add the selected capture interface