You can revert a story that you have published to being unavailable to others by unpublishing it.
Do the following:
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From the app overview, click
to view the stories. - Find the published story under Published by me.
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Right-click/long-touch the story and select Unpublish.
The Unpublish story dialog appears.
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Click Unpublish.
The story is unpublished and moved from Published by me to My own.
The story is no longer available to other users of the app.
Tip noteYou can also unpublish a story in the storytelling view by clicking 
and selecting Unpublish story, or by right-clicking a story in the story navigator.
and selecting Unpublish story, or by right-clicking a story in the story navigator.