I take it that you mean a bid? As an Ebay'er myself I stongly advise you to look on ebay for the answer, but from memory if you are a buyer, you can only retract a bid if you bid an amount higher than you intended to by mistake, and this has to be done more or less immediately. You can use the ask seller a question or contact member link and ask the seller to retract your bid for you. Sellers have the option to cancel bids, some say that people with zero or negative feedback will have their bids removed unless they contact them first. This is due to the amont of timewasters on there that win an auction and have no intention of paying for goods.. these clowns even have the nerve to leave the buyer negative feedback, which in some cases cost the buyer $20 US to have removed by using SquareTrade.