Your best bet is to get in touch with one of the admins
You'll need to provide source code and possibly (if a web challenge) a place they can test it, along with other people if they like it.
Try and catch them when they're active on IRC
so you can give them a tour of your challenge as well.
HTS is at the moment in a post-upgrade stage and access to certain things is still being setup, hence why an admin
is your best bet at this time.