How do you mail a letter to the usa from canada and then usa to canada?

help! or:help!or:Write the letter take it to the post office where you live tell them you want to mail it get the correct postage do the same thing wh

help!

or:help!

or:Write the letter take it to the post office where you live tell them you want to mail it get the correct postage do the same thing when you want to send it again.

Tags:letter,