Modifying a User in the Security Database
From InterBase
Go Up to Configuring Users
Use the ModifyUser method along with the properties listed in Adding a User to the Security Database to modify user information in the InterBase security database. You cannot change the UserName property, only the properties associated with that user name.
To modify user information you could display the user information using the example in Displaying Information for a Single User. The TUserInfo record is displayed in the Edit boxes. Use the ModifyUser code in the same way as the AddUser code.