If you need to cancel an order, whether it is one that you created or one that auto generated, you can do so pretty easily.

Navigate to the order you need to update.

Once you are in the order, select the gray pencil on the left near the order number.

You will be able to manually change the status in the pop up. Select drop down to view the different statuses.

Select the appropriate status from the drop down (this is also where you can select cancel, if necessary).

You can also remove or change any tags if necessary.

Once you have updated to your desired status/tag, you must select save on the bottom right.