The administrator or a privileged employee (Manage Users privilege is required) can change the password for a user account if the user has forgotten the password and not able to reset it.
At the top of your dashboard, click the module access icon > Administration > User to open the Manage Users page.
When you find the user, click on the user’s name. Basic details of the user’s profile is displayed.
Click the Change password button. The Change password page is displayed.
Enter the new password, and then again enter the new password to confirm as in the below fig.
For more information, check this-