He can click on "forgotten password" on the login page and receive a setup a new password. The validity of this email is 60 minutes by default. The user will then be able to create a new password.
If a user has problems logging in, the administrator can generate an email to reset the password to the user with a unique link which is valid for one hour. He/she can also define a temporary password for the user.
- Go to the settings of the interface in the 'Members' tab.
- Identify the user on the list in the 'Options' menu, and click on 'Defining a password'.
- Generate an email with a reset link.
- Or generate a temporary password.