Hi, 
In the Odoo demo environment, changing user passwords is restricted for security reasons. If you need to test user login functionality or work with different user accounts, you can either create a new user or use the provided demo user account with preset login credentials. It's important to note that the demo environment is not meant for long-term usage or production purposes. For full control over user management and password changes, it's recommended to set up your own Odoo instance.