Unfortunately pressing it only gets you this, and nothing more which is not in the least bit intuitive or helpful. No instructions, no hints what to do. Zilch.
I still don't know how to actually set up multiple replies to several posts.
I deleted my reply to Simon because it was just too tiresome to respond, yet again, to his veiled barbs, and because his "Seriously?" insulted my intelligence, because it was a wholly un-neccessary jab.
I was indeed, serious, Simon. And you knew that. The pertinent question is, were you?