Blog Subscription Shortcode
The [blog_subscription_form] shortcode is used to easily display a blog subscription form on a post or page. This lets readers sign up to receive email updates whenever a new post is made.
The form is a bit different depending on whether or not the user is logged into a WordPress.com account:
Form for Logged-in Visitors

Form for Non-logged-in Visitors

To use the shortcode:
- Open your Page or Post editor.
- Click on the HTML tab (rather than the Visual tab, which is usually open).
- Paste [blog_subscription_form] into the box.
- Save Draft, Update, or Publish.