how the heck do you join it? It takes you to an account opening area for Sedo.com but if you already have a sedo.com account, you cannot really use that area. Is there a way to access SedoDNA's services while you are logged in at Sedo.com??
The "Advertiser" link takes you to "Contact us - Enter your personal information below and we will contact you shortly" so I can only guess it is not yet automatized self-service and probably not enabled in their general system.