You cannot update the email address because this is the unique identifier for the user. A user can only be assigned to a single email address. If you wanted to edit the user's email address manually you would need to do so either in the db directly, or you can use a tool like DataAssist to create a set of pages that will allow you to edit the user's records.
You can add in the order id to the order history page within DW by dragging and dropping the OrderID from your WADAorders recordset that is in the bindings tab. The size and color are currently missing from the details for the orders. I think that I have opened a ticket for you on this issue.
When doing order fulfillment you should do a search and check the box to show only un-shipped items. This will give you all of the orders that have not been shipped starting with the oldest. When you do this search you will probably want to start with the first order that you see in the list, when you ship the order update the order information and check the box for shipped. Also, you can send a shipping confirmation email from here as well.