Where can i find the Free Reg file to edit?

[bitofgrace]

Hi

I need to add a field validation script on the free registration form. Where can i find the file to edit?
The custom field is present on the form, and required - but i need validation of the submitted contents before the user can claim their username and finalize the registration.

-grace

[bitofgrace]

ooo - nevermind found it here in the forums.

wp-content/plugins/s2member-pro/includes/templates/forms/paypal-registration-form.php PERFECT

Can anyone help with how to go about adding a validation script (that i have) to affect a custom field?