Hey Hyojung,
To setup LEDs and DROs you will use the Screen Editor and add whatever you like to your screen. The attached picture will show how to Get and Set a screen DRO. The lua script uses the "Name" field to find the screen property. In the example picture, I have a button that will increment the Plung Feedrate DRO by 1. So it gets the current value and adds one to it and then updates the DRO.
I Have a macro that uses the LEDs, but I will have to find it. From what I remember, you use the same "Get" and "Set" command, only it will be looking for a 1 or 0.
Hope this helps.