Built in Subscribe button?

Back in the day I remember there used to be a little black “Subscribe” button that would appear at the bottom right for visitors. Has WP removed this feature? Is there no built in subscribe form option? I find this strange for a blogging site.

I see in the options there is a checkbox for “Anyone can register” and an option to select new users for which I selected “Subscriber”. Is this for the subscribe button? Where’s the button?

Thanks