I think I have 403. In the Documentation folder there is only one file with installation instructions, that's UPGRADE.TXT. It has 5 steps, none of which say anything about setting up a cron job.
The link you gave isn't a FAQ, it's a long thread from 2004 with a lot of confusion like something called "spider". WTF is that? And again, no mention of cpanel. I can probably figure out crons in cpanel, but first someone has to actually tell me to do it!
If the task runs in the forum footer that would be okay. But if it's only in the Classifieds footer then it may not be visited enough.