No. Once the order is submitted it virtually immediately goes to production and thus cannot be edited in any way anymore but will print it exactly the way you designed it at that stage.
So make sure you have your project perfect to go before you finally order it. That includes checking all your photos for correct positioning, resolution, but also correct delivery address, voucher application and email address.
For perfect projects see our tips and tricks here: http://www.my-books.com/tips-for-perfect-projects/