Passwords can be reset by the User, or by the Administrator. Either method will result in an email being sent to the User with a link to reset the password.
Details on how Users can reset their own Password can be found here:
For details on how to reset a Password from the User Administration Activity
From the Manage Users tab:
The following prompt appears:
Users will receive an email with a link to enable them to reset their password.
More information for Users on the process to follow once they receive the email can be found on the Resetting your Password page.