Choose webcam to use on Streaming PC

Hi,

I am remotely accessing my home pc webcam using splashtop. It used to work fine (to check on the dog when we are out), but recently I've installed a virtual camera (with OBS). Now when I try to remotely access the webcam I get a blank screen. I cannot see anywhere in the Splashtop streamer where you set the default webcam you want to connect to. Any ideas??

Regards Phil