I would like to edit or delete one of "my story" entries. Please help.
If you select - Memories> Gallery> Stories you should be able to view any/all stories you have created and then select/open the one you want to edit/delete.
If you hover over the story you can click the circled checkmark and then choose the Action you would like.
If you open the Story you can choose to Edit it or choose the Action (delete) there - as well.