How to Cancel Open Orders on Web Site?
If you have one or more open orders that's not matched yet and waiting to be triggered or matched, decreases your available balance. If you need more available balance or don't want your open order(s) to be matched or triggered, you must cancel your open order(s).
You can see your open orders in the bottom right corner of the screen on the website and if you wish, you can cancel the order by using the X button in the relevant line or edit your order by clicking on the pencil icon. When you select the "All" tab, you can see your open orders in all pairs.
How to Cancel Open Orders on Mobile Application?
You can view your open orders from the Open Orders section at the bottom of the Trade screen. You can use the "Cancel" button for the order you want to cancel.