Usually user authentications is done with user name and matching password. Of course the password must be only known by you and kept secret. Even the system and the administrators don't know your passwords, because they are stored encrypted.

Unfortunatly you lost your password, hence your account is useless. In order to create a new password (in a secure way) you must identify yourself as an existing user. If a matching user is found, the process to renew your password will be initialised.