I try | MarsW

<?php
class Account extends CI_Controller {

    public function __construct()
    {
        parent::__construct();
        $this->load->model('account_model');
        $this->load->library('table');
    }

    public function index()
    {
        $this->load->helper('form');
        
        $data['title'] = 'Account';
        $this->load->view('account/apply');
    }
    public function ok()
    {
        $this->load->view('account/success');
        $this->account_model->apply_account();
    }
} 

<?php echo form_open('account/ok') ?>
<fieldset>
    <legend>申請資料</legend>
    <label for="account">Account</label> 
    <input type="text" name="account" /><br />

    <label for="country">Country</label> 
    <select name="country">
        <option>台灣</option>
        <option>中國</option>
        <option>香港</option>
    </select>
    <br />
    <input type="checkbox" name="agree" />
    已閱讀相關資料<br />
    <br />

    <button type="submit" name="submit" class="btn">Apply</button>
</fieldset>
</form>

success