Pagination tutorial -> i`m needing help!

Code:
//Load the CI LIbraries we need for this functuon

      $this->load->library('table');

      $this->load->library('pagination');

      

          $this->load->model('admin/dominio');

          $dominios = $this->dominio->get_pai();

      

      $rows = $dominios['num_rows'];

      

      //Config for Pagination including getting the total number rows in DB

      $config['base_url'] = base_url().'admin/dominios/index/';

      $config['total_rows'] = $rows;

      $config['per_page'] = '25';

      $config['uri_segment'] = '3';

      $config['num_links'] = '2';

      $this->pagination->initialize($config);

      

            $output = "<table>

                                    <thead>

                                        <tr>

                                            <th>#</th>

                                            <th>área temáticas</th>

                                            <th>filhos</th>

                                            <th>traduções</th>

                                            <th>traduzir</th>

                                            <th>termos</th>

                                            <th>ver +</th>

                                            <th>editar</th>

                                            <th>excluir</th>

                                        </tr>

                                    </thead>

                                    <tbody>";

            //contador para efeito zebra

            $counter = 0;

            foreach($dominios['result'] as $dominio):



                //lista as subcategorias

                $id = $dominio->id_dominio;

                $filhos = $this->dominio->get_child($id);



                //lista a quantidade de termos em um domínio

                $this->load->model('admin/termo');

                $termos = $this->termo->count_termos($id);



                $traducoes = $this->dominio->traducoes($id);



                if($counter == 0): $class = 'class="odd"'; $counter++; else: $class = 'class=""'; $counter = 0; endif;

                $output .= "<tr ".$class.">";

                    $output .= "<td>".$dominio->id_dominio."</td>";

                    $output .= "<td>".$dominio->dominio."</td>";

                    $output .= "<td>".$filhos['rows']."</td>";

          $output .= "<td>".$traducoes."</td>";

          $output .= "<td>".anchor('admin/dominios/traduz/'.$id, 'traduzir')."</td>";

                    $output .= "<td>".$termos."</td>";

                    $output .= "<td>".anchor('admin/dominios/vermais/'.$id, 'ver +')."</td>";

                    $output .= "<td>".anchor('admin/dominios/edit/'.$id, 'editar')."</td>";

                    $output .= "<td>".anchor('admin/dominios/del/'.$id, 'excluir')."</td>";

                $output .= "</tr>";

           endforeach;

            $output .= "</tbody>

                            </table>";

                            

            $output .= $this->pagination->create_links();



            return $output;