Unfortunately, once an account has been created, the Username cannot be modified.
However, you can update the email address and the full name fields. To do so, please go to Settings>User Settings
Please do not forget to choose the save button
To create an account by copying an existing one, please see this article
Should you have any questions or require further assistance, please contact us at: https://franchiseblast.freshdesk.com/helpdesk/tickets/new