Before following these steps, ensure that you have a personal account on the website. You should have got an email which the subject is “[Legato Team] Your username and password” and containing your username and password, as well as a link to http://legato-team.eu/wp-login.php.
If you didn’t get this email, first check you spam folder. If you really did not get the email, please contact me (Alexandre Bilger) asap. Thanks.