How to Use Check Boxes wtih signup.html?

Hello,

I am trying to get some check boxes to show in my signup.html. I have programmed them in via Admin control panel, but am not quite sure how to have them show up in the form.

I have this programmed in, but it doesn't seem to work:

Code:

<p>{if $smarty.request.price_group == -2} </p>
    <h3 align="left">NOSA UK Mail-in or Walk-in Attendance:</h3>
    Please select from event registration choices below. You may register for all events by selecting the &quot;<strong>Attending All Events</strong>&quot; box; or, you can select <strong>paired events</strong> or <strong>single events</strong>. We need to know what events yo will be attending to get an accurate head count for planning purposes.{/if} 
    <br />
    <input name="attending_all" type="checkbox" id="attending_all" value="attending_all" />
    Attending All Events</td>
</tr>{/if}

Any ideas?