You can change the properties of the Database Manager operator (DBM operator) and the database system administrator (SYSDBA user).
...
1. Choose Instance ® Configuration ® Users.
2. Select a user.
3. Choose Actions ® Properties.
4.
Choose
General and make your changes.
See also: Properties of a DBM
Operator
If you want to change passwords, you may need to transfer the database
instance to the appropriate operational state.
See also: Changing a User
Password
You have changed the user properties.