그누보드로 만든 사이트에 아이프레임을 사용하려면 어떻게..

<tr>            <th scope="row"><label for="wr_1">유튜브<strong class="sound_only">필수</strong></label></th>            <td>                <div id="autosave_wrapper">                    <input type="text" name="wr_1" value="<?php echo $write['wr_1'] ?>" id="wr_1"  class="frm_input" size="50" maxlength="255">                </div>※ http://www.youtube.com/embed/ 뒷부분            </td>			        </tr>

<iframe width="100%" height="190" src="https://www.youtube.com/embed/<?echo $list[$i]['wr_1'];?>?autoplay=1&loop=1" frameborder="0" allowfullscreen></iframe>