Unfortunately I am unfamiliar with the SiTracker appliance so may not be a whole lot of use...

My first suggestion would be to consult the SiTracker Wiki and/or Forums

Failing that preferred option, most web apps save the bulk of their data in a database, so if you dig into the included DB you may be able to find the records there and manually remove them. Note, I would highly recommend doing a backup of your DB prior to fiddling around in there just in case something goes wrong...

And if you resolve your issue, then it'd be great if you could post back as it will probably help someone else along the way... Thanks :)