To cancel an order from the Order Status window, perform the following:
On the Order Status window, double-click the live order you want to cancel.
If the Confirm
Cancels option is enabled, the Confirm
Cancel Order window will appear.

Click the Yes
button to confirm the cancellation of the Live order.
NOTE: If you do not wish to view the Confirm
Cancel Order window in the future, click the check box so that
it is clear.
The order's row turns red and its status becomes Pending Cancel.
If the cancel is accepted by the exchange, any remaining unfilled shares are canceled.
If the cancel is not accepted by the exchange, the order remains live or pending.
You can place your cursor over
the CXLD status indicator to view more details about the cancelled order
TIP: You can also add a speed key to quickly cancel an order.