You will not be able to edit the order form once it is submitted. However, adding more pages to your paper is possible. You will need to go to the My Orders section and place a new order indicating that it is related to the one that has the Processing or Completed status. Pay attention that the price for your order will be recalculated to cover the deadline changes. In case of any questions or inquiries at this stage, feel free to contact our support managers and ask them to guide you.