ok found it
in subscription/subscription.php line 482
/* // Add exceptions for “profile” key.
// Is there a custom url?
if (!empty($this->options[$key . ‘_url’])) {
header(‘Location: ‘ . self::add_qs($this->options[$key . ‘_url’], ‘nk=’ . $user->id . ‘-‘ . $user->token, false) . $params);
die();
}
// Is there a dedicated page?
if (!empty($this->options[‘url’])) {
header(‘Location: ‘ . self::add_qs($this->options[‘url’], ‘nm=’ . $key . ‘&nk=’ . $user->id . ‘-‘ . $user->token, false) . $params);
die();
}*/
// Use the standard page.
//header(‘Location: ‘ . plugins_url(‘newsletter’) . ‘/subscription/page.php?nm=’ . $key . ‘&nk=’ . $user->id . ‘-‘ . $user->token . $params);
header(‘Location: ‘ . $MY_BLOG_URL.’?nm=’ . $key); /*. ‘&nk=’ . $user->id . ‘-‘ . $user->token . $params);*/
die();
}