I wonder if the editor is theme based or a basic part of WP. If it is theme based, you might not have access to it for various reasons. I don't know for sure though. If you setup another site or change themes temporarily do you get access to the editor?
Thank you for your answer. However what I really want is to access the HTML code, when I go to appearance and then editor it is telling me that the editor is not enabled. How do I enable the editor and get to access the code on the back end?