Click the icons to turn the inputs on or off. In the above image the Screen and Microphone is on. The Camera is off.

To enter the Screen settings click the arrow next to the icon of the monitor. A preview of the screen that will be recorded will be displayed.  If you have multiple screens you will be able to select that from the drop down. You also have the option to select only a part of a screen that you wish to be recorded.

To enter the Camera settings click the arrow next to the icon of the camera. A preview of the camera that will be recorded will be displayed.  If you have multiple cameras you will be able to select that from the drop down.

To enter the Audio settings click the arrow next to the icon of the microphone.  The microphone being used for your recording will be listed. If you have multiple microphone options you will be able to select that from the drop down. You will also so your feedback visually in the center of the microphone icon.