want visitor's free posting without Login

I've already questioned two time about that. Please see my screenshot and understand my asking then please give me the exact solution.
I need visitor can post their q or ans without login and it is not publish. it goes to draft and it will publish after user review.
my 1st screenshot, you see my setting configuration. --- ok it's done. but when visitors ask a question it directly published by the name of assigned user.
please see the 2nd screenshot.
why done that? i dont need it. i need when visitor ask a question it goes to draft, not publishing at that time. it will publish after user reviewed it.