How can I create a multi-step form?

I’m trying to copy this multistep form:

https://preview.webflow.com/preview/multi-step-form-webflow?utm_medium=preview_link&utm_source=showcase&utm_content=multi-step-form-webflow&preview=a003445941dad21edf3a4d35db6e4358

However, when I get to the final slide I can’t figure out how to get the “Next” button to go away and only show the “Submit” button. How can I do this?