Custom Wp-signup.php

Ok I have been looking all weekend and I can not find a step by step process.

The signup page uses the home page theme and it is rather annoying.

so I would either like to make the theme change or I would like to make my own page with the signup form inside.

something like this: http://www.wix.com/ would also be cool.

Step by step instructions would be fantastic because all I read is make a page template...yes umm no. but. maybe. err.

I have a plugin for putting a user registrator on a page, so can I not just do this for a blog sign up?