User account password can be reset by the user or by the system Admin.

Password Reset by the User

To reset your account password, 

1. Go to My Menu (top-right of the page) --> Change Password
2. Enter the new password
3. Click Save

Password Reset by System Admin

The system Admin can reset the password in 2 ways:

From the user's profile page:

The Admin can visit the user's profile and click Reset Password in the Admin Bar. 

From User Manager:

Alternatively, the admin can also change the user's password from the User Manager. He only needs to click Reset Password in the user's row.

Watch how it is done here: