How to customize django's UserCreationForm?

I want to customise the django.contrib.auth UserCreationForm to:

• Ignore the email field, and only di开发者_Python百科splay a user-name which must be an email address
• Prompt the user for first name and last name.

I'm using django-registration if that makes a difference.

How can I do this?

I can subclass the form, but how do I tell the auth system to use my version of the form instead of the default one?

Thanks

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I think this is the answer:

http://dmitko.ru/?p=546