In my post right above yours, you can see an @ sign where I linked Artyom and Kyrill Zorin to this thread. Click on the names azorin or zorink with that @ sign symlink and it should open a popover window with their profile information and a Message button in the upper corner.
Alternatively, you can contact them from the email receipt you received with your copy of Zorin OS Ultimate (It should contain a link).
You can also use this contact form :