Hello venusnajad56,
Do you have any code already that you can post here? It's impossible to know what you are exactly trying from your posting. Also, are you talking about a real, hardware LED connected to your computer, or about an indicator in the UI of your application?
Ingo – LabVIEW 2013, 2014, 2015, 2016, 2017, 2018, NXG 2.0, 2.1, 3.0