The "S" line of the DM13A is your controller PIN, not the "S" BUS.
To use a common low-power LED, simply connect it to the pin (anode) and to the ground bus (cathode) using a series resistor that can vary from 100 Ω to 1 kΩ depending on the indicator brighntess you need.
Please read this page (if you didn't yet): http://simvim.com/tech_dout.html - all is simple and clear.
Make all as described. And about the ENA (chip enable) signal you can read on the picture too..
ALso see this topic.