If you have forgotten your database user password, you can reset it from Plesk Panel. To do this just follow the steps below:
- Log in to Plesk
- Go to "Websites & Domains"
- Click on "Databases"
- Click on Users tab
- Click on the appropriate database user
- Enter the new password
- Click "OK" button to save changes
This completes the process of updating the database user's password. Don't forget to update the password in your web applications (eg WordPress, Drupal) where this database user account is used.