Because it's not located there. You'll use this as your form action: http://yourdomain.heliohost.org/cgi-sys/FormMail.cgi Don't forget to replace "yourdomain" with your heliohost domain. Or you can just find the url at your cgi center.
Try again. It was showing as inactive yet again for some reason. I unsuspended it and changed your last login date to a few days ago (it was 1/5/14, hence the inactivity suspension). Let us know if it still doesn't work and we'll escalate this.
The 'www' is just a link to public_html. Anything you change in public_html will show up if you view 'www', and vice-versa. The files are not stored twice.