Betty, You have the ability to edit or delete any post you create and delete any thread you start. To edit or delete a post, click on the icon that looks like a piece of paper on the post you'd like to change. To delete a thread you've created, click on that same icon of the original posting. In this situation, I'd prefer that you share what you learned, since we're all here to learn from one another.
I'm going to delete the post just to prove to myself I can. I thought I had tried to do so and failed, but I didn't have any instructions at the time. Perhaps I didn't click on the "right" picture. I'll let you all read this a day or two and then try to delete it!