Archiving a story removes it from the dashboard, but doesn't change whether or not a story is available to audiences. (For that, stories can be hidden or moved to the trash.)
Archive a story by selecting Archive from the ... menu in the dashboard.
Restore an archived story by selecting Show archived stories at the bottom of the dashboard, and selecting Restore from the ... menu. If you meant to delete a story, select Move to trash.
To return to your dashboard, hit Back.