Develop a use case for the activity of change user password for a website

A use case for the activity of changing a user's password for a website could be as follows:

Title: Change User Password

Primary Actor: Registered User

Goal in Context: The registered user wants to change their password for the website.

Preconditions:
- The registered user is logged in to their account.
- The website has a feature to change the user's password.

Trigger: The registered user clicks on the "Change Password" button on the website.

Main Success Scenario:
1. The website displays the "Change Password" form.
2. The registered user enters their current password, new password, and confirms the new password.
3. The website validates the entered passwords.
4. If the entered passwords are valid, the website updates the user's password and displays a success message.
5. If the entered passwords are invalid, the website displays an error message.

Extensions:
- If the user enters an incorrect current password, the website displays an error message and prompts the user to enter the correct password.
- If the user enters a new password that does not meet the website's password requirements, the website displays an error message and prompts the user to enter a valid password.

Postconditions:
- The registered user's password is updated in the website's database.
- The registered user can log in to their account using their new password.