1. Go to Sales > Unresolved Online Sales Order.  See if the order is here, look at the unresolved online order error, and fix the issue.  Complete the order.
  2. If the order is not in unresolved online sales orders, Go to Analysis > Information Library.  Click Add an ad-hoc query.  Select the source view of Sales Orders and click ok.  In the middle, click on date and move to Include Records Where.  Set the criteria equal to the date of the order.  Then click on the amount in the middle and move to Include Records Where, set the criteria equal to the order amount.  Then output constituent's name and order number.