setting up Joomla to accept new user registrations

Hi,

I'd like to know how I can link new registered users on my site to community Builder.

When a new user comes in, Joomla only asks for Name, Username, email and password.

I'm using module_login in Joomla but I've seen a CB Contacts 1.1, but doesn't work for 1.5 properly.

Can I edit a php file so that it uses 'CB' as part of the user profile registration?

Name, Username, email and password in joomla. Study, fun & interest in 'CB'.

Thanks in advance.

Kari