Enter your login (generally first character of first name + last name, all lowercase) and validate. If your account is valid, enabled and the e-mail was correctly configured you will receive an e-mail with a link to set an other password (the old one is lost cause). The link is valid for 24 hours. This function is available only for simple researcher's accounts and not for any type of privileged users (archivists, managers ...) for security reasons. Also note if you connect successfully to your account before the e-mail's link is used, the reinitialisation demand is cancelled.