There are hundreds if not thousands of people who will have successfully installed the same script before you. The fact is that you haven't followed the editing procedure correctly, specifying incorrect or incomplete paths, not getting the correct path to Perl or the wrong path to sendmail or whatever mail program is being used on your server. The final pitfall you can make is to do the entire above and still find that the script does not function. If you transfer your files using this mode then the script will fail to run as this mode inserts extra characters in the script which cause it to fall over. Incidentally, don't forget to change the mode back to binary when you want to upload your regular HTML files, the HTML will function O.K but the graphics will not show up correctly.
Graphics HAVE to be transferred in binary mode.
Your Web Hoster will normally offer this service and for the comparatively small fee that they charge it's money well spent. The benefits of learning to do it yourself are worth the learning curve. Bulletin boards, message boards, Mailing lists, you can make a highly professional web site by utilising CGI Scripts that are freely available on your site.