Moderators have the option to delete and edit all works, so it's difficult for us to know what non-moderation staff can and can't see/have access to. In THEORY you should be able to edit your own uploads, but I could have sworn that, during my own time as a regular member: there was no obvious way to move or delete your own images.
I mentioned it to DB once, but he assured me the options are there. Maybe I overlooked them.
If they ARE there, they should appear at the bottom of your post as a series of icons along with "report post", "etc"
You should be able delete your post through the "edit post" icon.