Forum Error message when trying to update content within a forum module
 

I don't know much about this stuff and I'm afraid to try to fix it myself, but I think it might be something simple. Here's the error message I'm getting:

Forbidden
You don't have permission to access /forums/editpost.php on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.


I should have access to everything. I am the administrator/owner of the site. Anyone have any wisdom?