mailing passport to Buffalo from Canada for TRV

[prateek_sikka]

Hello,
I want to get a multiple-entry visa and in order to do so I need to send my passport to Buffalo. I am currently in Canada. I am kind of confused in the mailing process.
 
1. I buy an Xpressspost-USA envelope and fill in my address in "From" field and Consulate's address in the "To" field.

2. Now in this envelope, I put inside the filled forms, my passport and an Xpresspost National envelope(not USA). In the xpresspost national envelope, I fill my address in the "To" field, but I don't know what to fill in the "From" field.
 
Kindly reply me as soon as possible.
THANKS!!