Drupal is the name of the software that powers iFOSSF. There are Drupal web sites all over the world, and many of them share their registration databases so that users may freely log in to any Drupal site using a single Drupal ID.
So please feel free to log in to your account here at iFOSSF with a username from another Drupal site. The format of a Drupal ID is similar to an e-mail address: username@server. An example of a valid Drupal ID is firstname.lastname@example.org.