How to change an account password?
You can use this WHM instance to change the password of any cPanel account.
Once you have logged into WHM, go to “Account Functions” => “Password Modification”.

If you have many domains you can specify the domain whose password you want to change, then click on (2) to select it.

Once the domain is selected, you must enter the desired password at point (3)A. At point (3)B you can choose whether the password will be visible or not. At point (3)C you can choose for the system to generate a password.
Once you’ve chosen the desired password, save the changes by pressing the button indicated at point (4).