Step 1: Log in to your account and you will see the Market page.
Step 2: Tap 'Order History' at the top, right corner of the page.
Step 3: Select 'Pending' and tap 'OK'.
Only Pending Orders can be cancelled.
Step 4: Choose the Order that you would like to cancel and tap the 'Cancel' button.
Alternatively, you can also tap the Order to expand its full details and scroll down until you see the 'Cancel' button.
Step 5: Tap 'OK' to confirm. You will receive an email notifying the order cancellation.