You need to go to the bottom of the page, click on contact us (Listia) and file a support ticket. To the best of my knowledge I do not have the power to cancel bids. If someone bids above you your bids will be refunded. If you end up being the winning bidder I believe that you can ask LIstia for a bid refund all you have to do is give them the reason for your request but the final determination is theirs.