You can make many changes to the items after submitting by pressing the title. When the new page open you can see many choices at the right top corner. Here you can choose either to edit or delete or any other choice.
It seems you are referring to "question", but I would like to delete a set of slide show that I had erroneously submitted twice. I clicked on the title, but the only option that I found was to change some details. I need a more detailed guidance.