Hi TVHCare,
Thanks for hopping in the forum. To provide a little background, the emails and pages that subscribers see after they subscribe are attached to the signup forms section of your MailChimp list. These wouldn’t be connected to the plugin.
In MailChimp, when the name of the list is changed, the header on the signup forms and response emails would stay the same. So that name would need to be changed separately. Here’s a helpful guide from the MailChimp knowledge base that can help with customizing the forms and response emails: https://kb.mailchimp.com/article/how-do-i-build-and-design-my-signup-form-and-response-emails
If you need additional help customizing the forms and response emails, it might be best to reach out to the MailChimp support team. https://mailchimp.com/contact/
Let us know if you have any other questions.
-mc_d