if you like someone's post or respect or hated what they said, give their rep a +1 or -1 and tell them why. ^>^ reputation is located under the persons name in thier post, click the + icon.
you can give positive or negative reputation, other people can see how much rep you have, be it positive or negative, so it will be easy to tell who the trolls are ![v](http://s104.ucoz.net/sm/19/v.gif)