don't know how familiar you are with CGI (Common Gateway Interface) so this may be starting too basic -
CGI is a binary folder (hince the bin suffix) where programs to interact with users reside. Programs, usually written in perl language, operate on commands given in the HTML pages on the site and are called by reference in the page. For example, a form (in HTML) can be filled in, then executed by the 'submit' button that uses the 'post' command in a file. Example:
<FORM METHOD="POST" ACTION="/cgi-bin/cgiemail/samplecat.txt">
You can view the source code for an example here:
http://www.samplehouse.com/samplecat.htm
The call is to the .txt file that tells the program how to parse the information and send email to the owner.
You write the HTML form on the site, and the CGI program activates the program and the .txt file tells it how to send it.
Form mail (as it is generically termed) has had a bad rap with spammers using it to send their messages, so Page-Zone has disabled all formmail derivitives. But all you need to do is to rename the program to some other, and it still works fine. Information on the NMS version of the granddaddy of form mail scripts by Matt Wright is at:
http://nms-cgi.sourceforge.net/scripts.shtml
There is also some good instructions in the read me files for it.
Good luck. It is easier to do after the first time. Like riding a bicycle?