i want to send a letter to America from Melbourne what do i have to do to do that?

Answer 1

well.. on the outside of the envelope, write the name of the person, the address, the country, the state, the city, and the zip code.

Answer 2

Check with your local post office, they'd know better than most of the folks in the US would. Usually you just write the same address as your recipient normally uses and add 'USA' at the end. Then check with the post office to make sure you have enough postage.