cara merubah identitas di email dengan Toko Online Codeigniter (PHP 7)

Assalamualaikum,.. buka file : aplication/models/model_main.php
pada baris 188 cari script ini :
function pesan_masuk_kirim(){
    $nama           = $this->input->post('a');
    $email           = $this->input->post('b');
    $subject         = $this->input->post('c');
    $message         = $this->input->post('isi')." <br><hr><br> ".$this->input->post('d');
 
    $this->email->from('robby.prihandaya@gmail.com', 'PHPMU.COM');
    $this->email->to($email);
    $this->email->cc('');
    $this->email->bcc('');
 
    $this->email->subject($subject);
    $this->email->message($message);
    $this->email->set_mailtype("html");
    $this->email->send();
 
    $config['protocol'] = 'sendmail';
    $config['mailpath'] = '/usr/sbin/sendmail';
    $config['charset'] = 'utf-8';
    $config['wordwrap'] = TRUE;
    $config['mailtype'] = 'html';
    $this->email->initialize($config);
}
 
ubah menjadi pada baris berikut ini :
$this->email->from('alamat_email_anda@gmail.com', 'WEBANDA.COM');

Assalamualaikum,.. 
terimakasi banyak kak