Firstly, you will need to head to the CoinMetro Exchange Platform.
At the bottom of the page underneath the price chart, you will see the Active Orders tab. Here you can see all of your current active limit orders.
Then, find the order you wish to cancel and select the red cross button as highlighted in the image below.
Finally, confirm the cancellation of your order on the cancel dialogue box.
Please note, if your order has already been partially filled, only the remainder of the order will be cancelled. It is not possible to reverse filled orders.
Congratulations, you have successfully cancelled your limit order!