Como agrego esta opción en los blogs de mi web

class blogs extends story{
    public $list_type = 'ul';
    function blogs() {
        global $nav,$ubase;
        set_title(t('Blogs'));
        $nav[] = url('blogs','Blogs');
        //$this->stories_from_cat = t('Lasted blogs in this category');
        $this->top_stories = 1;
        $this->about_the_author = 0;
        $this->stories_from_cat = t('Related posts');
        $this->tags = 1;
        $this->allow_vote = 1;
        $this->story_opts = array('tofavorite'=>1);
        parent::story();
        $this->act_write = t('added a blog post');
        $this->label_entry = t('blog entries');
    }

    function convert_content_before_insert($content) {
        if (!file_exists('js/tiny_mce/jquery.tinymce.js')) {
            return nl2br(
                preg_replace('/<a /i','<a rel="nofollow external" ',$content)
            );
        }
        else {
            return preg_replace('/<a /i','<a rel="nofollow external" ',$content);
        }
    }

    function ajax_form($page_type='') {
        global $client;
        if (!$client) die('login');
        if ($page_type == 'u' || $_REQUEST['page_type'] == 'u') {
            $privacy_form = privacy_form();
        }
        echo '
        <div>
        <strong>'.t('Blog Title').'</strong>: <input type="text" size="55" name="blog_title" /><br />

        <textarea rows="9" cols="55" name="blog_content"></textarea><br />
                  
        '.t('Tags').': <input type="text" size="25" name="tags" /> <span class="sub">('.t('Separated with commas').')</span>
        </div>
        <div style="padding-right:25px;text-align:right">
        '.$privacy_form.'</div>';
        exit;
    }

    function ajax_post() {
        global $client,$page_type;
        if (!$client) die('login');
        if (!$_POST['blog_title']) blogs::ajax_error(t('Please input a Title'));
        $vote_options['rating'] = t('Rating');
        foreach ($vote_options as $key=>$vla) {
            $ratings[$key] = array('score'=>0,'users'=>0);
        }
        $page = story::check_page_access($_POST['page_id']);
        $story = array(
            'cid' => 0,
            'page_id' => $_POST['page_id'],
            'page_type'=>$page['type'],
            'title' => $_POST['blog_title'],
            'content' =>  nl2br(preg_replace('/<a /i','<a rel="nofollow external" ',$_POST['blog_content'])),
            'uid' => $client['id'],
            'created' => time(),
            'app' => 'blogs',
            'var5' => $_POST['privacy'],
            'rating' => serialize($ratings)
            );
        $stags = array();
        $tags = explode(',',$_POST['tags']);
        if (is_array($tags)) {
            foreach ($tags as $tag) {
                if (count($stags) > 5) {
                    continue;
                }
                $tag = strtolower(trim($tag));
                if (strlen($tag) > 0 && strlen($tag) < 50) {
                    $stags[] = $tag;
                }
            }
        }
        if ($num = count($stags)) {
            $story['tags'] = implode(',',$stags);
        }
        if (sql_insert($story, tb().'stories')) {
            $sid = $story['id'] = mysql_insert_id();
            save_tags($stags,$sid,'blogs');
            // write act
            $attachment = array(
                'cwall_id' => 'blogs'.$sid,
                'uri' => 'blogs/viewstory/'.$sid,
                'name' => $_POST['blog_title']
                );
            $app = array('name'=>'blogs','id'=>$sid);
            $stream_id = stream_publish(t('added a blog'),$attachment,$app);
            $set_story['id'] = $sid;
            $set_story['stream_id'] = $stream_id;
            sql_update($set_story,tb()."stories");
            echo t('Blog Added!').' <a href="'.url('blogs/viewstory/'.$sid).'"><strong>'.t('View').'</strong></a>';
        }
        else {
            blogs::ajax_error('failed to add blog');
        }
        echo blogs::ajax_form();
        exit;
    }
    function ajax_error($msg) {
        echo '<div style="color:red">'.$msg.'</div>';
        echo blogs::ajax_form();
        exit;
    }
 
}