How do you delete threads? I have some threads that I want to take down, but every time I try to delete them, I get a message saying I do not have access to this page. Am I doing something wrong? Is there an error in the system? What can be done to fix this?

Your post count isn't high enough to delete posts. That feature is off until you hit 500/750/1000 posts (can't remember which off the top of my head).