This demo assumes you've already logged in to cPanel, and are starting on the home screen.
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Now let's learn how to change a database users password.

Click the "MySQL Databases" icon.
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Locate the user whose password you want to change, and click "Set Password".
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Enter and confirm a new password, then click "Change Password".
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That's it! The database user's password has been changed.
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This is the end of the tutorial. You now know how to change a database user's password in cPanel.

https://www.youtube.com/watch?v=d70TblnZJic