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 edit and select the pencil icon as highlighted in the image below.
Here, you will be able to view your order and make any necessary adjustments including editing the limit price, the order size, and even adding a comment!
Now, all you need to do is select Confirm Adjustment and the changes will be applied to your order.
Congratulations, you have successfully edited your limit order!