Once you have created a new Live Event, the "Event Settings" screen will allow you to configure the Event.
By default, the application will use your webcam as the video source.
Note: make sure you allow the application access to your camera and microphone.
Camera: select the web camera you want to use from the list of available cameras.
Audio: select the audio device you want to use to record sound
Resolution: select the resolution of your video upload. If you have a slower connection or experience issues, you can try and reduce the upload resolution.