how to use "name" instead of "uname" at the option "Select the user, if you want" in the index.php?op=form ?

I mean the code in the index.php like that:
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// selecionar usu嫫io
$userstart = isset($HTTP_GET_VARS['userstart']) ? intval($HTTP_GET_VARS['userstart']) : 0;
$member_handler =& xoops_gethandler('member');
$usercount = $member_handler->getUserCount();
$nav = new XoopsPageNav($usercount, 200, $userstart, "userstart", "op=form");
$user_select = new XoopsFormSelect('', "user_id",null,5,true);
$criteria = new CriteriaCompo();
$criteria->setSort('uname');
$criteria->setOrder('ASC');
$criteria->setLimit(200);
$criteria->setStart($userstart);
$user_select->addOption('0',"--------");
$user_select->addOptionArray($member_handler->getUserList($criteria));
$user_select_tray = new XoopsFormElementTray(_MD_XMAIL_SELUSER , "
");
$user_select_tray->addElement($user_select);
$user_select_nav = new XoopsFormLabel('', $nav->renderNav(4));
$user_select_tray->addElement($user_select_nav);
$sform->addElement($user_select_tray);
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if I want the 'realname' show in the table(not 'uname'), which line should be changed?

code or crap?