As far as I know, you just have to click the button that makes you go anon. Not sure if you can do that only if you didn't block anonymous answerers, though.
Just like you already did with this question.
Oh no, I meant after I posted it
Just don't update the question. Either you worded the question badly or you're being very silly.
Have an opinion?
If you click the anon box under comment box asker goes anon.
Just click anonymous on your question it should work i think it did for me
Just click anonymous. You don't have to update it.