The easiest/quickest route would be to use a mailto anchor tag in your html. That has the disadvantage of needing to use a email client on your user's box. Some people will not want their email address going with the feedback.
If you really want to do it with CGI, you'll need to enable
CGI in your web server. If you are using apache, you want
to add the execCGI option for your cgi-bin directory. See
the apache docs/faqs for details. It is simple to do. You can use a very simple piece of CGI to confirm that the web server is working.
There are a few examples of CGI code in faq452-653.
Once you're sure your web server is doing the CGI trick, you'll need an html input page to submit the fields you want to report and a piece of CGI to catch the submitted page and do something with it like write the info to disk or email it somewhere. Again, see the faq for some examples.
'hope this helps
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