You should be able to edit. You won't be able to delete. You can mark items that have sold using the "sold" button in your post. If you have something you really want to have deleted, I can hide it for you, but you would have to send me individual links.
David, Thanks for responding. I was going to delete some of my old things that sold then add new items to the same ad. I guess that is not the way if works here. So I guess I need to start a new ad? I have several new guns I want to sell. Let me know if I am right. Thanks Gary Malmquist