An operator can modify only the transaction entered by him for a limited period of 10 days. In order to do that it is necessary to proceed as follows: 
Clicking on main menu item , is displayed a page with transaction list. Transactions are ordered by default from the most recent to te oldest.

To modify a transaction an operator has to click on icon that He can find near a transaction. The following screen will open:
After done all modifications just click on 
Where the operation was successfully inserted, will appear a screen that indicates that the transaction has been registered:

NOTE: An operator can modify and NOT cancel a transaction. To cancel a transaction or modify it after 10 days from the registration an operator has to contact his own CB