WordPress can be rather baffling. I can enable comments on new post going forward but not on an existing one. So leave comments here if you want to discuss the survey.
Update: Finally found the switch on to how to enable comments on an already existing post, but I think I will stick with this format for now. It is more natural to leave comments at the end of an article than at the top. This counter-intuitive format is hard-wired in the WordPress theme that I picked, and as there are not many good ones that you can use for free, that’ll be the work-around for now.