Market orders – may be cancelled when they are entered during the hours when the market is closed and orders are not being submitted to the broker. During this period your market order will have a 'hold' status and a 'delete' button will be available to the right of the market order information.
Limit orders – may be cancelled at anytime by simply clicking on the 'cancel' button to the right of the limit order information. The unfilled limit order, in whole or in part, will be cancelled on a best efforts basis subject to any prior fills.
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here for more information on Sale Order Status.