В function_global.php 
найдти:
function get_user_class_color($class, $username)
{
  global $tracker_lang;
  switch ($class)
  {
      case UC_VLADELEC:
      return "<span style=\"color:#990000\" title=\"".$tracker_lang['class_vladelec']."\">" . $username . "</span>";
      break;
    case UC_SYSOP:
      return "<span style=\"color:#0F6CEE\" title=\"".$tracker_lang['class_sysop']."\">" . $username . "</span>";
      break;
    case UC_ADMINISTRATOR:
      return "<span style=\"color:green\" title=\"".$tracker_lang['class_administrator']."\">" . $username . "</span>";
      break;
    case UC_MODERATOR:
      return "<span style=\"color:red\" title=\"".$tracker_lang['class_moderator']."\">" . $username . "</span>";
      break;
     case UC_UPLOADER:
      return "<span style=\"color:orange\" title=\"".$tracker_lang['class_uploader']."\">" . $username . "</span>";
      break;
     case UC_VIP:
      return "<span style=\"color:#9C2FE0\" title=\"".$tracker_lang['class_vip']."\">" . $username . "</span>";
      break;
     case UC_POWER_USER:
      return "<span style=\"color:#D21E36\" title=\"".$tracker_lang['class_power_user']."\">" . $username . "</span>";
      break;
     case UC_USER:
      return "<span title=\"".$tracker_lang['class_user']."\">" . $username . "</span>";
      break;
  }
  return "$username";
}

и заменить следующим: 
function get_user_class_color($class, $username)
{
  global $tracker_lang;
  switch ($class)
  {
      case UC_VLADELEC:
      return "<span style='color:#FFF; text-shadow: 0 0 14px Sienna, 0 0 3px Sienna, 1px 1px 3px Sienna; *color:Sienna;' title=ЭксПромт>" . $username . "</span>";
      break;
    case UC_SYSOP:
return "<span style='color:#FFF; text-shadow: 0 0 14px Navy, 0 0 3px Navy, 1px 1px 3px Navy; *color:Navy;' title=Директор>" . $username . "</span>";
      break;
   case UC_ADMINISTRATOR:
     return "<span style='color:#FFF; text-shadow: 0 0 14px darkgreen, 0 0 3px darkgreen, 1px 1px 3px darkgreen; *color:darkgreen;' title=Администратор>" . $username . "</span>";
      break;
    case UC_MODERATOR:
     return "<span style='color:#FFF; text-shadow: 0 0 14px #FF0000, 0 0 3px #FF0000, 1px 1px 3px #FF0000; *color:#D21E36;' title=Модератор>" . $username . "</span>";
      break;
     case UC_UPLOADER:
     return "<span style='color:#FFF; text-shadow: 0 0 14px Orange, 0 0 3px Orange, 1px 1px 3px Orange; *color:#D21E36;' title=Аплоадер>" . $username . "</span>";      
     break;
     case UC_VIP:
      return "<span style='color:#FFF; text-shadow: 0 0 14px #9C2FE0, 0 0 3px #9C2FE0, 1px 1px 3px #9C2FE0; *color:#D21E36;' title=VIP>" . $username . "</span>";
      break;
     case UC_POWER_USER:
     return "<span style='color:#FFF; text-shadow: 0 0 14px DarkRed, 0 0 3px DarkRed, 1px 1px 3px DarkRed; *color:DarkRed' title=Опытный>" . $username . "</span>";
      break;
     case UC_USER:
      return "<span style='color:#FFF; text-shadow: 0 0 14px Gray, 0 0 3px Gray, 1px 1px 3px Gray; *color:Gray;' title=Юзер>" . $username . "</span>";
      break;
  }
  return "$username";
}