This website reminds me a lot of one of its fellow competitors, Swagbucks, they seem to borrow several things from each other, so if you have been using Swagbucks, PrizeRebel should be easy to pick up, vice-versa. I will say PrizeRebel has a much better selection of rewards, referring gets you about twice of what swagbucks would get you and the site itself looks really nice, unfortunately, well to me at least, PrizeRebel seems to demand more time and effort than Swagbucks, for instance Swagbucks has a better selection of videos, mobile apps to do offers on the go, daily polls, etc.
But if you do decide to join Prize Rebel, feel free to use my referal link: http://www.prizerebel.com/index.php?r=CNShawarma