You may find that you need to add a note to an existing order an example would be if you register a customer through the registration page but their payment is deferred.
You can do this in back office by following these steps.
- Find the order you wish to add a note to either in Contact management or orders
- At the bottom click Edit
- Fill in the Note field at the bottom
- click Save
Your note will be visible in contact management history as well as on the order its self.