Ah no, sorry! That wasn't quite clear, was it? We'll be posting rules for the drabbleathon later on, but the way that we run it, we post a prompt and drabbles are left in comments to that post. You can post directly in the comment, or you can link to a post in your journal. Then at the end, we make a masterlist of all the drabbles written for the event.
Hope that helps! Let us know if you have any other questions!