wishlist-user-register

add_action('user_register', 'my_new_member');
function my_new_member($user_id) {
	global $wpdb;

	//Example of how to get the fields submitted via the form
	if (isset($_POST['first_name'])) {
		$firstname = $_POST['first_name'];
	}
	else {
		$firstname = '';
	}
	
	//Adjust based on your specific columns
	$data = array (
		'user_id' => $user_id,
		'first_name' => $firstname,
	);

	//Adjust with name of your database table
	$wpdb->insert('wp_my_crm_data', $data);
}