Here are instructions for Internet Explorer version 7. If you have a different version the directions change slightly.
Look at the menu on the browser window in the upper right. Click on "Tools". On the General tab look for the "Browsing History" section and click on "Settings". On the screen that pops up click on "View Files" which brings up a window showing all your internet cookies. Sort by name or Internet Address. Look for and delete any files that have "californiaspecial.com" or "www.californiaspecial.com" in them. They'll be named something like, "cookie:user@californiaspecial.com/" (where "user" is your log in name for your computer, not your forum username)
Once you delete those try coming back to the forums and log in again.