Things that are obviously not done yet. As of the last update of this document, that includes site stats and the forum.
First, in order to use the bug tracker, sign up for a user account at GeniusWeb.com. Then wait for notification that your account has been approved, and visit GeniusWeb to set your login cookie for later convenience.
The best way to find bugs is to browse the site with Internet Explorer, version 6 especially. The developer uses Firefox almost exclusively during the initial phase and then patches things to work with IE later. IE6 is the most hellish modern browser to code for, so most bugs will show up there.
By testing this system you agree to keep confidential any information that you receive or access whether intentionally or by accident, and to report any breaches to GeniusWeb.com.
In general, report anything that doesn't behave in an expected manner and causes an inconvenience to the user.
Of course that particularly includes critical errors, but most of those are eliminated prior to the code being refreshed on this test site.
When reporting, assuming your account has been approved and you've logged in at GeniusWeb, you should visit the bug tracker and follow the directions carefully. Incomplete bug reports waste both your time and mine, so take a minute to provide all relevant information.