what is the return address to fedex my broken phone to

This is a worldwide forum and for all I know you could be in Mongolia. Anyway, I don't know where you ship it. Apple doesn't say anywhere on their web site because it probably depends upon where you are and because it is all printed on the return label they provide you. The only time I have shipped things to them I just stuck the label on the box and dropped it off at the shipper store and never looked at the address (or if I did it was probably a PO box). If you didn't get the return kit then contact Apple and tell them.

Click here --> https://support.apple.com/choose-country-region Select your country, then a product. If you don't see one that handles your issue then keep experimenting with selections until you reach one that gets you a chat session or a telephone call and get the representative to redirect you.

or:

Contact Apple for support and service --> "See a list of Apple phone numbers around the world."

Click here --> https://support.apple.com/HT201232

I still don't know where to ship it, but I do know where you can find it. Apple tells you where on the shipping label it provides. I have never seen a shipping address of that kind posted here and I wouldn't trust one to be consistent even if you did find one posted.

There should have been a return label under the label used to ship the box to you. You should reuse the same box to return the device.

Read the article in the Related Article link at the top of this page.