Configure one output channel (in the image, it is pin , which is the 6th pin on the CC3D) with the values above.
Be sure to configure the correct bank for the BankUpdateFreq setting and the BankMode setting for the chosen channel/pin.
You can see which channel corresponds to which bank on the configuration output page of the GCS.
You cannot drive the external LED directly, you need to have it triggered. The following curcuit uses a MOSFET to trigger the LED voltage.