Add Some Options in the registration

[balance12]

I want to add a now field to add.. the one of canalmail.. it is not like genter or sex.. its to subscribee by mail, to some newsletter.. where i have to add the code+

[Marco van Herwaarden]

<a href="http://www.vbulletin.com/docs/html/profile" target="_blank">Custom Profile Fields</a>