Post pages URL not editable

When I create a post they are all is connected to a specific url which I cannot find in my editor anywhere. I did have this page as a published url once but have since disabled it. I thought I deleted it but its still is the main url for all posts I create. And when I click on a post on an individual posts in the posts page it says "Page not available". Also, I notice I do not have the ability to edit the url of a new post when I create it. Please help!!! Steve