You can login to the demo system as follows:
User: demo
Password: 1timedollar
Feel free to add and modify listings and just generally go crazy. It'd be best if you didn't delete all the user accounts, but if you must...
To see Local Exchange in action, you can go to the Fourth Corner website, but you will be restricted to the public areas of the site.
You can download Local Exchange and see general information at our Source Forge page.
For questions you can email here.
Happy Trading!