[Al Skierkiewicz]

Yuan,
You will get lot's of help at your first event with this. There is a document outlining the pneumatics system that is available on the First website. Download it and check it over. I bet you find where your robot doesn't match the example. Everything you describe indicates you have the wrong ports on the regulator connected and so the regulator is doing nothing. Easy to fix with a couple of wrenches, and some teflon tape.