In your active template file profile_add_body.tpl find the line:
<!– Visual Confirmation –>
ABOVE that line, add:
<!– BOT HACK –>
<tr>
<td class=”row1″><span class=”gen”>Are you a robot? *</span></td>
<td class=”row2″><select class=”post” name=”imarobot”>
<option value=”yes”>yes</option>
<option [...]