Hi:
The file you need to edit is catalog/includes/add_ccgvdc_application_top.php and look for
// The settings below determine whether a new customer receives an incentive when they first signup
//
// Set the amount of a Gift Voucher that the new signup will receive, set to 0 for none
define('NEW_SIGNUP_GIFT_VOUCHER_AMOUNT', '10');
//
// Set the coupon ID that will be sent by email to a new signup, if no id is set then no email :)
define('NEW_SIGNUP_DISCOUNT_COUPON', '3');
and then edit to suit your situation.
The default is to send out a $10 gift voucher for every signup.
The Traveller