1. Log into WordPress Backend
2. Go to Plugins- Add New. Search For “Mailchimp List Subscribe Form” Plugin by Mailchimp. Install And Activate it.
3. Go to the plugin and go to its settings.
4. Log into your Mailchimp account in a separate window or tab.
5. Back on the Settings page for the Mailchimp Plugin, Click “Connect”
6. Select the appropriate list, and click on Update List.
7. Edit Custom Styling to your needs. Click on Update.
8. In Appearance – Widgets, Drag the Mailchimp widget into desired Sidebar.