Plesk panel version 12.0.18
Steps for change the Databases username and password
Steps for change the Databases username and password
1. Login to Plesk Panel
2. Click Websites & Domains
3. Find any Databases link and Click Databases link from that page
4. From there you can see all your database defined in the plesk panel
5. Click the users tab near the Databases tab
6. Click the database which you wish to change the password
7. The give database user name and enter the new password
8. Click save