How can I create a sign up form like edublogs.org?

Hi there,

How can I create a sign up form like this:
=> http://edublogs.org/signup-4ae/?Pro=1

I want to implement the 3 steps with same layout for our blog.

- Which plugins do I need?
- How can I find the sign up page of Supporter?

Thank you in advance!

Cheers, Stijn