There appears to be no way to do that on the user side, so the only way would be for FunSubstance to delete it behind the scenes (or add a way for the user to do it). Asking on the comments sections doesn't help unless FunSubstance sees it (no normal user can help). There is a feedback page that you can use the contact FunSubstance directly. Since only they can do something, it would be best to do that:
http://funsubstance.com/page/contact/?ref=feedback
They usually respond very quickly. Good luck!
http://funsubstance.com/page/contact/?ref=feedback
They usually respond very quickly. Good luck!