Hello!
You should be able to use your DIO lines on your card to make an LED turn on and off. When you installed your DAQ driver, it should have come with several ready made examples that show you how to control these DIO lines from LabVIEW. You can open LabVIEW, then go to "Help" -> "Find Examples". Within this example finder look for an example that will show you how to control your DIO lines.
I hope this helps. If you need more assistance, please reply back.
Regards,
Anuj Dharia
Applications Engineering
National Instruments