create signup and sign in page. where user selected by options from student or teacher when registrations

div class="container" id="main">
        <div class="signup">
            <div class="signup-form">
                <form action="<?php echo site_url('/signup'); ?>" method="post">
                    <div class="signup-form-title">
                        <h2><?php echo lang('signup_form_title'); ?></h2>
                    </div>
                    <div class="signup-form-input">
                        <input type="text"