修改文件./inc/toolbar.php, 在适当位置添加以下部分代码。

         array(
              'type'   => 'format',
              'title'  => $lang['qb_code'],
              'icon'   => 'mono.png',
              'key'    => 'm',
              'open'   => "''",
              'close'  => "''",
              'block'  => false
              ),
        ## 以下为添加代码
         array(
              'type'   => 'format',
              'title'  => $lang['qb_code'],
              'icon'   => 'code.png',
              'key'    => 'c',
              'open'   => "<code>\n",
              'close'  => "\n</code>",
              'block'  => false
              ),