Acesse: Admin CP > Look&Feel > Manage Template & CSS > Forum View > forumIndexTemplate

Procure por:
Código PHP:
<tr class='subhead altbar'>
                    <
th scope='col' colspan='<if test="endannouncements:|:$this->memberData['is_mod'] == 1">6<else />5</if>'>
                        {
$this->lang->words['forum_topic_list']}
                    </
th>
                </
tr>
            </if>
            <!-- 
BEGIN TOPICS -->
            <if 
test="hastopics:|:is_array( $topic_data ) AND count( $topic_data )">
                {
parse striping="forumTable" classes="row1,row2"}
                <foreach 
loop="topics:$topic_data as $tid => $data"
Substitua por:
Código PHP:
<tr class='subhead altbar'>
                    <
th scope='col' colspan='<if test="endannouncements:|:$this->memberData['is_mod'] == 1">6<else />5</if>'>
                        <if 
test="$this->hasPinned=1">Tópicos Importantes</if><if test="$this->hasPinned=0">Outros Tópicos</if>
                                             
                                                 
                    </
th>
                </
tr>
            </if>
            <!-- 
BEGIN TOPICS -->
            <if 
test="hastopics:|:is_array( $topic_data ) AND count( $topic_data )">
                {
parse striping="forumTable" classes="row1,row2"}
                <foreach 
loop="topics:$topic_data as $tid => $data">
                                <if 
test="$data['pinned']">
<if 
test="$this->hasPinned=1">
</if><else />
<if 
test="$this->hasPinned">
<if 
test="$this->hasPinned=0">
</if>
<
tr class='subhead altbar'>
<
th scope='col' colspan='<if test="endannouncements:|:$this->memberData['is_mod'] == 1">6<else />5</if>'>
Outros Tópicos
    
</th>
   </
tr>
  </if>
</if> 
Fonte: SOS Invision