Custom wp-signup.php page such as on Edublogs.

Hi guys,

I would like to create a custom sign-up page for WP(3) multisite such as on :

Unfortunately the wp-signup.php in the root of my wordpress site does not pick up my custom template. Is it possible to just create a new page in wordpress and embed the specific code for the sign-up form in HTML?

I did not find a plug-in for this in your excellent archive - and nothing specific in the forum search either.

I would very much appreciate further instructions.

Thank you very much!