Sitefinity does not support such functionality to edit the order details in the back-end, orders management is not supported on this time.
The option is through code, you can see more detail in Sitefinity Documentation
. Some custom control could be created to edit the data you need
or of course directly into database. If do so, do not forget to back up your the database in advance.
I have created a feature request for such functionality in PITS
where it could be voted.
Thank you for pointing out the need for such functionality.
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items