Allowing your visitors to subscribe to your newsletter should be easy.
This allows you to add a newsletter sign-up form to your widget areas. When a guest adds their email via the form, it will be added to the mailing list / audience. You will then use the easy-to-use MailChimp app to create and send customized newsletters to your fan hoards.
Follow the instruction:
Install & activate the MC4WP: MailChimp for WordPress recommended plugin.