@El Orans: That path should be changed to what is relevant to your vB install and whether you changed the path of your admin control panel such as:
http://yourdomain.com/vb/admin/vbstopforumspam.php
Alternative, assuming you have stopforumspam installed and working:
1) log into your admin control panel
2) look for the sidebar on the left side and scroll to the bottom (Statistics and Logs)
3) Expand the "Statistics and Logs" section
4) You should see a "vbStopForumSpam Logs"