No, there are no requirements exactly. You install it, play around with it, and if you want to, use the online form to submit bugs, crashes, suggestions, quirkyness, etc.
You get points for your submitted issues. Top point leaders gets one of the prizes listed.
Some issues are worth more points than others, like repeatable crashes.
At least, that's how it worked last year.
Jason Capriotti
ThyssenKrupp Elevator