Yes, you can cancel an offer after it has been submitted, until the bid opening date. Log in to HUDHomestore.com, click Bidder Functions, and go to Review your Bids. Click the bid you want to cancel. Click the Withdraw this Bid button. A summary screen will appear, and you will again have to click the Withdraw this Bid. The bid is then withdrawn from consideration by HUD. You will not be able to cancel an offer after the bid opening date has passed.