First off, to join this web ring, your site must have at least some type
of sighting, UFO, or Alien setting to it. Second, you don't have to be
in geocities, but it helps.
You Can: Submit Your Site, or edit it.
And once you have added your site to the que, you can add the HTML fragment
so that you can be added to the actual ring. The code is sent to you with a confirmation e-mail.