Programming an Arm?!?

[BrynneRaines]

I've only used Labview for about 7 months and I am still confused. Our team is trying to use a PID to control where the arm starts and stops. For example, only rotating 270 degrees. My problem is that I understand the mechanics of a PID and what it means. I'm just not sure how to even begin building it. I was told to connect a PID to a Motor but what else? How do I even define a program for an arm in the Begin.vi? Some help would be great!