hnu 如何添加到动态显示牌上？ ib信息如下，试了n次没成功 HORIZONS BETAPRO NYMEX NATUR Underlying HNU Industry Funds Category Equity Fund Sub-category Financial Services Security Type STK Exchange SMART Primary Exchange TSE Currency CAD Region Name America Trading Hours Regular Trading Hours Current Next Exchange is closed 09:30 AM - 04:00 PM 04:15 PM - 05:00 PM Exchange is closed 09:30 AM - 04:00 PM Exchange Time Zone Eastern Standard Time