*update4* SOLVED
in SugnupForm.php, changed

	$groups = $member->Groups();
		$groups->setByCheckboxes(array("newslettersubscribe"), $data);

to

if($group = DataObject::get_one('Group', "Code = 'newslettersubscribe'")) {
           $member->Groups()->add($group);
        }	

*update3*
I need some way to get Member id and add it to the Gourp_Member table when people register for the newsletter.

*update 2*
When I add a member manually from the newsletter tab in the admin panel, the row is added to the member table, in the same format...

*update*
I figured out that it is writing to the "Member" table in the database. Is there a way for the news letter to automatically add members from the Member list?

------------------

I followed the guide here:
http://doc.silverstripe.com/doku.php?id=recipes:simplesignupform

(I see the note saying its outdated.)

What could be done to make this work? The only problem I have is that it isn't adding anything to the database.

here is what I have:

SignupForm.php

<?php
class SignupForm extends Form {	
	function signup($data,$form) {
		// Create a new member using the data from the form
		// TODO: needs validation - all fields filled out, email doesn't exist already etc
		$member = new Member($data);
		$member->write();
		
		// Add the new member to the 'newslettersubscribe' group
		$groups = $member->Groups();
		$groups->setByCheckboxes(array("newslettersubscribe"), $data);
		
		// Write the Member table row
		$member->write();
		
		Director::redirect('/sign-up-complete/');
	}
}	
?>

SignupPage.php

<?php
class SignupPage extends Page {
}
 
class SignupPage_Controller extends Page_Controller {
	function AfterContent() {
		// This is a dirty hack, suggestions?
		// It returns early if we're on the thanks page - we don't want the form on that page
		if($this->urlParams[Action] == 'thanks') return;
		
		return new SignupForm($this, "AfterContent", 
			new FieldSet(
				new TextField("FirstName", "First Name:"),
				new TextField("Surname", "Surname:"),
				new TextField("Email", "Email:")
				
			), 
			new FieldSet(
				new FormAction("signup", "Subscribe")
 
			), 
			new RequiredFields(
				"FirstName",
				"Surname",
				"Email"
			));
	}
}
?>

I have a newsletter named newslettersubscribe. I made it from the newsletter tab of the admin panel.

I know there is a "subscribe form" page type, but I don't want the users to need to use a checkbox for selecting the news group.

Is there a way to set a "default" news group maybe?