Each organizational profile has at least one administrator. You can find out who the administrator is before and after your registration. This article also explains how you can add multiple colleagues as administrators.
If you have received an invitation to become a participant in the organization the email contains the name of the administrator as the sender of the message.
If you are logged in, click into Organization Settings in the bottom left corner. Navigate to the menu on the left, click into the User Rights section, then click on Administrators. You will then see who the administrator(s) of the organization are.