How To Write Address If Sending To Different Country . The second line contains the apartment or house number and street name. Knowing how to write an address can sometimes get confusing. List of Postal Codes (ZIP codes) in the Philippines FAQ.ph from faq.ph In the top right corner of the envelope you place a international postage stamp. I once handled a foreign letter that took an hour and a half to figure out. Just remember that your return address needs to be in the uk.