Option 1 – the one I prefer since it is cleaner and simpler — and the form itself is hosted on MailChimp.
But the link to the MailChimp site doesn’t work.
I’ve contacted support via email. Steve should get a response.

Option 2 – Embedding an actual contact form in a portion of your website. It’s bulkier and less aesthetically pleasing. However, it means that people don’t need to be redirected away from the website to sign up.