Now how do I use it. I'm too scared to do anything for fear that I'll blow up my car.

http://www.ross-tech.com/vag-com/cars/applications/a4s4.html

http://www.ross-tech.com/vag-com/cars/audiB5.html<ul><li><a href="http://www.ross-tech.com/vag-com/tour/main_screen.html">http://www.ross-tech.com/vag-com/tour/main_screen.html</a</li></ul>