I believe that you should see an 'edit' as well as 'delete' button for your own posts when you are logged in.
I find it weird that you don't. We as TA's have a couple more options, so unless I create a dummy user I cannot really test it. But I do remember that before I became a TA that I could at least edit or delete my own posts.
Maybe one of the Admins can confirm this for us? Or maybe you can PM your Community Manager?