Most people had this issue before, due their crappy website. It's hidden in one of the pull down menus. When choosing which consulate for visa application, say Guangzhou, you should choose "Guanzhou interview waiver", instead of B1/B2. If you have made an appointment for interview, you can cancel the appointment, then cancel the application, and them reapply.
还没有去中信银行，第一步只填写了d160，然后第二步在大使馆网上签证申请。我看攻略说，在申请的过程中会出现免面签的选项，但是我这里直接到了预约时间的页面
Most people had this issue before, due their crappy website. It's hidden in one of the pull down menus. When choosing which consulate for visa application, say Guangzhou, you should choose "Guanzhou interview waiver", instead of B1/B2. If you have made an appointment for interview, you can cancel the appointment, then cancel the application, and them reapply.