[PyroNET]

It's in there (In the FORUMDISPLAY template). Look for the comment "<!-- Active Users in this Forum (and sub-forums) and Moderators -->". The table holding the sorting options looks like

<table cellpadding="0" cellspacing="1" border="0">
<tr valign="bottom">
	<td class="smallfont" style="padding-$stylevar[right]:$stylevar[cellpadding]px">
		<div><label for="sel_sort">$vbphrase[sorted_by]</label></div>
		<select name="sort" id="sel_sort">
			<option value="title" $sort[title]>$vbphrase[thread_title]</option>
			<option value="lastpost" $sort[lastpost]>$vbphrase[last_post_time]</option>
			<option value="dateline" $sort[dateline]>$vbphrase[thread_start_time]</option>
			<option value="replycount" $sort[replycount]>$vbphrase[number_of_replies]</option>
			<option value="views" $sort[views]>$vbphrase[number_of_views]</option>
			<option value="postusername" $sort[postusername]>$vbphrase[thread_starter]</option>
			<if condition="$show['threadratings']"><option value="voteavg" $sort[voteavg]>$vbphrase[thread_rating]</option></if>
		</select>
	</td>
	<td class="smallfont" style="padding-$stylevar[right]:$stylevar[cellpadding]px">
		<div><label for="sel_order">$vbphrase[sort_order]</label></div>
		<select name="order" id="sel_order">
			<option value="asc" $order[asc]>$vbphrase[ascending]</option>
			<option value="desc" $order[desc]>$vbphrase[descending]</option>
		</select>
	</td>
	<td class="smallfont">
		<div><label for="sel_daysprune">$vbphrase[from_the]</label></div>
		<select name="daysprune" id="sel_daysprune">
			<option value="1" $daysprunesel[1]>$vbphrase[last_day]</option>
			<option value="2" $daysprunesel[2]>$vbphrase[last_2_days]</option>
			<option value="7" $daysprunesel[7]>$vbphrase[last_week]</option>
			<option value="10" $daysprunesel[10]>$vbphrase[last_10_days]</option>
			<option value="14" $daysprunesel[14]>$vbphrase[last_2_weeks]</option>
			<option value="30" $daysprunesel[30]>$vbphrase[last_month]</option>
			<option value="45" $daysprunesel[45]>$vbphrase[last_45_days]</option>
			<option value="60" $daysprunesel[60]>$vbphrase[last_2_months]</option>
			<option value="75" $daysprunesel[75]>$vbphrase[last_75_days]</option>
			<option value="100" $daysprunesel[100]>$vbphrase[last_100_days]</option>
			<option value="365" $daysprunesel[365]>$vbphrase[last_year]</option>
			<option value="-1" $daysprunesel[all]>$vbphrase[beginning]</option>
		</select>
	</td>
</tr>
<tr valign="bottom">
	<td class="smallfont" colspan="2">
	<if condition="$prefix_options">
		<div><label for="sel_prefixid">$vbphrase[prefix]</label></div>
		<select name="prefixid" id="sel_prefixid">
			<option value=""$prefix_selected[any]>$vbphrase[any_prefix_meta]</option>
			<option value="-1"$prefix_selected[none]>$vbphrase[no_prefix_meta]</option>
			$prefix_options
		</select>
	<else />
		&nbsp;
	</if>
	</td>
	<td class="smallfont" align="$stylevar[right]" style="padding-top:$stylevar[cellpadding]px">
		<input type="submit" class="button" value="$vbphrase[show_threads]" />
	</td>
</tr>
</table>