I know it's not really more advanced, but to get the button you have to press "go advanced" unless it's a reply that automatically brings you to the "official reply page" or whatever you want to call it instead of the quick reply button. (I changed the theme though, so maybe it's laid out different?)

But let's be honest, is there such a thing as "regular reply?" I KNOW NO REGULARITIES! (you can ask my ovaries)