When you click on the List My Active Orders link, it will throw up a screen that will list all your Active Orders:

You can edit each order by clicking on the pencil icon:

In the editing window, you can delete an order row, by clicking on the trash can icon:

You can add a comment, by clicking on the comment icon:

There is also an option for you to Cancel the Order:

Do get back to your previous window, click on the List Active Orders link at the top of the page: