Bagaimana Cara Merubah atau menambah modul pada kontributor di admin

Assalamualaikum Warahmatullahi Wabarakatuh...mas mau tanya bagaimanacara merubah atau menambah  modul kontributor di admin pada baris 74 id_modul di kontibutor.php
 
function pendaftaran(){
		if (isset($_POST['submit'])){
			$cek = $this->model_app->view_where('users',array('username'=>cetak($this->input->post('a'))));
			if ($cek->num_rows()>0){
				echo $this->session->set_flashdata('message', '<div class="alert alert-danger">Maaf, Username '.cetak($this->input->post('a')).' tidak tersedia.</div>');
				redirect('kontributor');
			}else{
				$config['upload_path'] = 'asset/foto_user/';
	            $config['allowed_types'] = 'gif|jpg|png|JPG|JPEG';
	            $config['max_size'] = '1000'; // kb
	            $this->load->library('upload', $config);
	            $this->upload->do_upload('f');
	            $hasil=$this->upload->data();
	            if ($this->input->post() && (strtolower($this->input->post('secutity_code')) == strtolower($this->session->userdata('mycaptcha')))) {
		            if ($hasil['file_name']==''){
		                    $data = array('username'=>cetak($this->input->post('a',TRUE)),
		                                    'password'=>hash("sha512", md5(cetak($this->input->post('b',TRUE)))),
		                                    'nama_lengkap'=>cetak($this->input->post('c',TRUE)),
		                                    'email'=>cetak($this->input->post('d',TRUE)),
		                                    'no_telp'=>cetak($this->input->post('e',TRUE)),
		                                    'level'=>'kontributor',
		                                    'blokir'=>'N',
		                                    'id_session'=>md5(cetak($this->input->post('a'))).'-'.date('YmdHis'));
		            }else{
		                    $data = array('username'=>cetak($this->input->post('a',TRUE)),
		                                    'password'=>hash("sha512", md5(cetak($this->input->post('b',TRUE)))),
		                                    'nama_lengkap'=>cetak($this->input->post('c',TRUE)),
		                                    'email'=>cetak($this->input->post('d',TRUE)),
		                                    'no_telp'=>cetak($this->input->post('e',TRUE)),
		                                    'foto'=>$hasil['file_name'],
		                                    'level'=>'kontributor',
		                                    'blokir'=>'N',
		                                    'id_session'=>md5(cetak($this->input->post('a'))).'-'.date('YmdHis'));
		            }
 
		            $this->model_app->insert('users',$data);
		            $datam = array('id_session'=>md5(cetak($this->input->post('a'))).'-'.date('YmdHis'),
		                           'id_modul'=>18);
		            $this->model_app->insert('users_modul',$datam);
		            $this->session->set_userdata('upload_image_file_manager',true);
					$this->session->set_userdata(array('username'=>cetak($this->input->post('a')),
									   'level'=>'kontributor',
	                                   'id_session'=>md5(cetak($this->input->post('a'))).'-'.date('YmdHis')));
				}
				redirect('administrator/home');
			}