vBulletin's user reputation system provides a way of rating users based on the quality of their posts. Users on your forums can add or subtract reputation points from other users by clicking the reputation link in their posts.
User reputations allow the users in your community to tell vBulletin which users are quality and which users are not. And in response to user feedback, vBulletin has the ability to label and reward users for the quality of their posts, as is indicated by their reputation.
Cara kasih cendol ijo / bata merah :
klik di bagian postingan yang bersangkutan, klik yg bagian icon timbangan, trus pilih :
1. i approve: kasih good reputation point
2. disapprove : kasih bad reputation