"Follow" email sign-up widget

Hi,

I’ve got WordPress installed on my own server. I notice this blog has a “Follow” button that floats at the bottom of the page and allows people to sign up for email notification of blog updates:

https://spiritsandcocktails.wordpress.com/

It looks like it’s hosted on the WordPress servers, though. Can I install this feature on my blog? This is mine:

https://www.901cocktails.com/blog/

Thanks,
Stew