Hello @sheismelissa,
So you’re seeing the error “You need to create a list first”?
In my experience, this usually means one of two things: either the API key you’re using is incorrect (make sure you have the correct API key entered), or your server is being blocked by MailChimp.
If your server is blocked by MailChimp, you’ll need to file a support ticket with your hosting company and ask them to investigate issues with your server communicating with the MailChimp API.
Sorry about the issues,
Kevin.