Redirect Codeigniter user when using the back button

If the user clicks the browser back button immediately after logging into my Codeigniter web app, they are returned to the login form. Instead, I want the user to be directed to the home page.

Also, when a user logs out, I would like to deny access to the account page, but I don't know how.

Any suggestions?

I have attached my login model below.

Controller:

class Account extends CI_Controller{
public function __construct()
{
    parent::__construct();

    $this->load->model('masterentry_model');
    $this->load->model('account_model');
    // Your own constructor code
}
public function index()
{
    if($this->session->userdata('logged_in') != TRUE){//checking loged in
    $this->load->view('signin'); 
    }else{
        $data['location'] = $this->masterentry_model->getLocation();
        $data['activeUser'] = $this->masterentry_model->userActive();
        $data['flag'] = "home";
        $this->load->view('home', $data);
        //redirect('account');
    }
}

//login process
public function loginsum(){

    $this->load->library('form_validation');
    $this->form_validation->set_rules('password', 'password', 'required|callback_check_exists');

    if($this->form_validation->run() == true){
        if($this->session->userdata('logged_in') == TRUE) 
        {
            //$path =  get_redirect_path();

            redirect('account');
        }
    }
    else{
        if($this->session->userdata('logged_in') != TRUE) 
        { 
        $this->load->view('signin');
        }
        else
        {
        redirect('account');    
        }
    }
}

//check email and password with database correct or not 
public function check_exists($password){
    $email = $this->input->post('email');
    $result = $this->account_model->logincheck($email, $password);
    if($result == 0)
    {   
        $this->form_validation->set_message('check_exists', 'Email (or) Password incorrect');
        return false;
    }
    else
    {
        return true;    
    }

}

//logout process 
public function logout(){
    $session_array = array(
            'email' => "",
            'user_id' => "",
            'logged_in' => FALSE
        );

        $this->session->unset_userdata($session_array);

        $this->index();
}

}

      

        
        
        
      

    

Model:

class Account_model extends CI_Model{

 function __construct(){
    parent::__construct();
 }

 public function logincheck($email, $password){
    //echo "SELECT * FROM `account` WHERE email = '$email' AND password = '$password)'";
    $query = $this->db->query("SELECT * FROM `account` WHERE email = '$email' AND password = '".md5($password)."'");

    //checking row existes
    if($query->num_rows() == 1){
        $row = $query->row();
        $session_array = array(
            'email' => $row->email,//storing email in session 
            'user_id' => $row->id,//storing userid in session 
            'logged_in' => TRUE
        );
        $this->session->set_userdata($session_array);

        return 1;
    }else{
        return 0;
    }
  }

}