Quote Originally Posted by Avidus View Post
To assign reputation(postive or negative) you click the scales to the left of the post, underneath the forum avatar. Then you choose Approve or Disapprove, then click Add to reputation. If you change your mind you can just click the srceen outside of the pop-up box to make it go away without giving +/- rep.

The ! right next to the scales is for reporting a post directly to a mod or to use on your own post to report undeserved negative rep.

Hope that helps
Just a note, f2p people can only see the scales on their own posts, and can't give out rep.