咨询JAL订票操作

第一次在JAL官网上订票，已付款并收到E-ticket itinerary/receipt。 后来又收到一封邮件，内有如下一段内容
Please purchase your ticket by April 16.
Purchasing Tickets/Payment
http://www.jal.co.jp/en/pay/
If you already have a ticket, please contact us by the above date to register your ticket number. Failure to do so may result in cancellation of your reservation.
这个“register your ticket number”是怎么回事，还必须去注册一下？只能电话操作吗？不会日语，英语也较差。。JAL网上全留的是电话，唯一一个邮箱是给聋哑人留的，不好意思用这个邮箱咨询。