The $db_cgi_url shoud point to the cgi-bin directory that has your link scripts in it. Go into the links.cfg file and set it to something like this (depending on what the actual URL is):

http://yourname.hypermart.net/links/cgi-bin

The links.cfg file is the only file that needs to be edited to get the script up and running.

Heres what the first part of my links.cfg looks like (I also use hypermart):

# Paths and URL's to Important Stuff
# --------------------------------------------------------
# PATH and URL of Admin CGI directory. No Trailing Slash.
$db_script_path = "/data1/hypermart.net/bidderz/scs/cgi/links/cgi-bin/admin";
$db_dir_url = "http://www.bidderz.com/scs/cgi/links/cgi-bin/admin";

# URL of User CGI directory. No Trailing Slash.
$db_cgi_url = "http://www.bidderz.com/scs/cgi/links/cgi-bin";

# PATH and URL of Pages to be built. No Trailing Slash.
$build_root_path = "/data1/hypermart.net/bidderz/scs/cgi/links/pages";
$build_root_url = "http://www.bidderz.com/scs/cgi/links/pages";

Hopfully this helps you some