You can edit the user details such as password and email.
Use the following command to update a user:
oracle-compute update user username [--fullname] [--email] [--password]
For more information, see CLI Reference for Oracle Compute Cloud Service.
To update a user using the API, use the PUT https://api.oc.example.com/user/
method.
For more information, see REST API Reference for Oracle Compute Cloud Service.