This dialog box allows you to select the correct input switch, for a given helicopter function.
The screen capture below illustrates choosing the Throttle Hold switch.
To choose a channel, flip the switch on your control box that you want to control the function.
Watch the indicators on this dialog box, as you flip the switch. One of them should change color in coordination with the desired switch. Use the mouse to click the button that changes color when you flip the desired switch on your controller.
If no button changes color on this dialog box when you flip the switch, then that particular switch on your transmitter is not available to control functions in HeliSimRC. You will have to use either a different switch, or the computer keyboard.