Hi Sukhi,
You said that you were having difficulty but didn't say what you have already tried, so I'll start really simplistically.
- You can find the DAQ Channel Control by right-clicking on the front panel to pull up the Controls palette, then go to Controls > I/O > DAQ Channel Name. Place this on your front panel and it should work just fine for you.
- If you do not see this control you may want to make sure that you have the DAQ Drivers installed. For LabVIEW 6.1 you should install these drivers: NI-DAQ Version 6.9.3 for Windows 2000/95/98/ME/NT/XP
- If you are still having trouble, then take a look at some of the example programs. You can find examples by going to Help > Find Examples > Hardware Input and Output > DAQ and then find the appropriate example for your use case.
One of these (or all three) should help you fix your problem.
Enjoy building the rest of your application,