I'm still getting used to it myself, and may not have everything configured correctly yet. Unless otherwise noted, all Bulletin Boards are open to public viewing by anyone. Click on a category to view Bulletin Boards falling under that category.
Unregistered users can freely view all messages and replies to messages.
Registration is easy and painless. But it does involve some steps designed to prevent abuse of the system. When you click on such a link, you will be taken to a page containing legal disclaimers and rules for proper use of the Bulletin Board. These rules are not meant not intimidate legitimate users, as you will see. You will next be taken to a registration page that asks you to fill in appropriate information and allows you to configure certain optional features the way you want them.