As some people have not been able to find the contact email on the submission call page (it is there) here is the contact information.
firstname.lastname@example.org (yes, I use hotmail)
Please include a subject such as "submission inquiry," "print book orders," "about audiobooks," or similar. Blank subject lines are likely to be thought to be spam and deleted...as is "hi."
THG StarDragon Publishing
Attn: Teresa Garcia
PO Box 249
McCloud, CA 96057