I always create a public name (like polpolrene) and always choose "www" as a service. it looks a bit weird when you enter that because it says: safe://www.polpolrene when you type it in the bar at the "create service" field. But when you do that you'll see a public container appear that says www-root
Maybe try that? So create a service called: www and you'll see www-root. That's where you put the indexfile and now the domain becomes safe://goku
Let me know if that works.