Itrader is a point that you give other members in exchange for deals done on the Buy/Sell/Trade section. You give +1 or - 1. You itrader is shown on your post in the BST section. You give a member an itrader by clicking on their itrader number and then submit feedback. Hope this helps
The sticky thread in the S & F forum should clear up all your doubts. http://forums.digitalpoint.com/showthread.php?t=201652. Edit- I see that Meethere has given the same url too Let us know if you have any further doubts mrkool.