You have to use Flat Rate when shipping from from an international location.
It's on the dropdown menu.
You have the choice of Economy/Standard/or Express Shipping from China/HongKong/Taiwan to Worldwide
or
Economy/Standard SPEEDPAK from China/HongKong/Taiwan
And be sure that Location is given on the listing as being in China, not in Canada.
This allows the buyer to consider possible import fees and also how long shipping will take.
You may also want to adjust your Handling time from the default one business day. There is a dropdown menu.
Remember that the Lunar New Year disruption will slow delivery and will take up most of February (12-26) .