I'll be happy to take care of that for you. Your order is still "pending" in the order system; but as soon as its status changes to complete, I will go ahead and cancel it for you.
If you're wanting to edit PDF files, then Acrobat is what you need. You can give it try for free for 30 days, if you'd like. For more information, please see www.adobe.com/products/acrobat.html.