In order to reset your password, go to the login page, enter your email address and click "Reset". Enter the position of the shown icon and click "Create new password". An email with a link to create a new password will be sent.
To reset a user's password select the user in the list to display the details. Click on
to send a password reset email to the user:

When a user simply forgot their password they can also reset the password on the login screen:
