If you want to change a user’s cPanel account password in WHM, you can do this easily using the Password Modification option under Account Functions. Simply navigate to Password Modification, search for the user account you want to change and then enter or generate a new password. To confirm, click change password.
You can also do this from the List Accounts section. Once in List Accounts, search for the account to want to change and click on the + symbol to the left of the domain name. Under Change Password, enter the new password and click Change.