Is it possible to create a custom "Thank You" page rather than the basic page. I'm looking to auto redirect the user back to the form after the "Thank You" page. The reason: We have a computer in a waiting room that folks sign up for our mailing list and then walk away, so we want the thank you page to revert back to the sign up form for the next person automatically.
While you can't customize that page itself, you can set a custom subscription confirmation page. This page would live on your website so it can be pretty anything you want.
If you click into the subscriber list this is for, click "Customize subscribe process" on the right hand side. Then, just edit the "Subscribe Confirmation Page".