You have to manually enter the URL and name of the story into your address bar. For example:
Where 'Magus: Betrayal' is the story and there is an underscore '_' for every space and '_0x3a_' for colins.
lol, could this be an advertisement for your own game? ;)
This is by design. If you don't want your story to be accessible, uncheck the sneak preview box in story options.
Or don't link the first page to the rest of the story till your ready to publish. :P
Yeah, you can't actually create a storygame with the same title as someone else.