You can view your open orders at any time within your Generation Portfolio. To start, click on your Generation Portfolio and select View Snapshot.
From your Portfolio Snapshot, select the Orders tab.
This will display any open orders as well as executed and canceled/expired orders.
You can expand the order by clicking on the order's line item:
This will show additional details about the order, such as a graph showing your limit price against the market price:
Click on Refresh to update the details of your order to the most current available:
Click on Cancel Order to Cancel an order:
You will need to confirm your desire to cancel any order:
Canceled orders will be moved under the heading Canceled and Expired Orders: