You can update your membership record in the directory by updating your association.drupal.org user record with the email you used for your membership. When you are logged in http://association.drupal.org click on my account, and the edit tab to update your email.

The easiest way to determine what that email is, is to look for your membership payment receipt and use that email. The subject of your Drupal association membership receipt is "Receipt - Drupal association organizational membership".

If you have any problems, use the contact link to get support.