老兄,没有H4-B,是H4,是你的配偶申请的签证。
在https://www.nvars.com/Production/userhome.aspx 预约个面谈的时间吧
然后会告诉你需要准备的材料,DS-156好像改成新表了(刚改了不到一个月),
一定注意,切记。
参见如下内容
原文链接 http://www.consular.canada.usembassy.gov/usa_visa.asp#ability
需要的材料CHECKLIST:
H4: Spouse/Child of H-1A/1B/2A/2B/3
DS-156 (application form).
Valid Passport (at least 6 months).
Proof of legal status in Canada: original or certified copy.
One passport-size photo.
Older passports containing previous visas.
Documents substantiating previous legal status in