You can use the Change Password User Action from the User List page (Accounts -> List Accounts) to change a user account password from the User List page. Follow these steps:
In the Administrator interface, click Accounts in the main menu.
The User List page displays on the List Accounts tab.
Select a user and click the User Actions drop-down menu.
To change the password, select Change Password.
The Change User Password page opens.
Type the new password and click the Change Password button.