php - insert a function forgot password Codeigniter

I need help to insert in the following site enter link description here a forgot function in Codeigniter. I try my self but give page not found. The form html:

<div >
 <h1>Welcome To Kea Talks.</h1>
 <p>Kea talks helps you to connect and share with the people in your Kea life.</p>
 <img src="<?php echo base_url();?>assets/css/images/logo1.png" alt="logo">
</div>
</div>
<div >
<form action="<?php echo base_url();?>index.php/user/signin" method="post" id="signin">
<div >
 <input type="text" id="signin-email" required name="email" autocomplete="on" placeholder="Email">
 </div>
 <table >
 <tbody>
 <tr>
  <td >
   <div >
    <input type="password" id="signin-password" required name="password" placeholder="Password">
   </div>
  </td>

  <td >
   <button type="submit" >
    Sign in
   </button>
  </td>
  </tr>
  </tbody>
  </table>
  <div >
  <span >·</span>
  <a href="<?php echo base_url();?>index.php/user/resend_password.php">Forgot password?</a>
  </div>
  </form>
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The function in models:

class user_model extends CI_Model{
function __construct(){
    parent::__construct();
}

function validate($email , $password){
    $this->db->where('email',$email);
    $this->db->where('password',$password);
    $query=$this->db->get('user');
    if($query->num_rows==1){
        $row = $query->row();
        $data = array(
                'userid' => $row->userid,
                'fullname'=> $row->fullname,
                'profilepic'=> $row->profilepic,
                'validated' => true
                );
        $this->session->set_userdata($data);




        return "1";
    }
    return "0";



}
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Controller:

class user extends CI_Controller{
    function __construct(){
    parent::__construct();
    $this->load->helper('url');

}
public function index(){
if(!$this->session->userdata('userid')){    
$this->load->view('user/login');
$this->load->view('header');
} 
else{

redirect('index.php/user/profile','refresh');
 }
 }
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2sd Part:

public function login(){
$name=$this->security->xss_clean($this->input->post('username'));
$pass=$this->security->xss_clean($this->input->post('password'));
$this->load->model('user_model');
$status=$this->user_model->validate($name,$pass);
    echo $status;
    }
    function logout(){


$this->session->sess_destroy();
    redirect('index.php/user','refresh');

      }
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