On the left sidebar, click on "Pending" then search for and click on the order you wish to cancel.
On the left slider that appears => Click the 3-vertical-dot icon at the top of the page => Click "Cancel Order".
If you do not want to return quantity to stock "uncheck" the box that says "Return Quantity to stock" on the subsequent pop-up message. Image 2016-07-26 at 5.55.10 PM.png 59.19 KB