MailChimp is a service for managing email subscription lists and sending bulk emails. We’ve added a plugin to allow your blog visitors to sign up to a MailChimp mailing list without leaving your blog page.
To use, it you will need to sign up for a MailChimp account. Once you’ve done that, go to your blog Dashboard, and select Settings -> MailChimp Setup. There are instructions there for setting up your details. When you have completed the setup process, you will be able to add MailChimp widgets to your blog pages, by going to Appearance -> Widgets, and dragging the MailChimp widget onto one of the sidebars.