The BBMS/BBPS usernames cannot be changed once assigned to the organization's Site ID Number, this is because the organization is registered with a BBMS/BBPS account upon creation. However if the account is created under an employee's name, additional BBMS accounts can be created and attached to the same Site ID Number to correct any mistakes with username designation. Please see How to set up/register additional BBMS accounts for further information. 

When creating your BBMS/BBPS accounts consider using a username pertinent to the organization such as OrgNameMS or OrgNamePS respectively. It is recommended not to use personal information to create the organization's username for BBMS/BBPS example: JohnSmith.