[Translation from Japanese to English ] I purchased A but it turns out I don't need it. So when I sold A on Amazon B...

Original text

私はＡを購入しましたが不要になりました。
そのためＡをAmazonで販売したところＢが購入しました。
購入者Ｂの発送先住所がＣでした。
そのため私はＡをＣに送ろうとしています。
どのような手続きをすればＡをＣに送れますか？

Translation / English

I purchased A but it turns out I don't need it.
So when I sold A on Amazon B bought it from me.
C is the shipping address for the buyer, B.
So I am trying to send A to C.
What should I do so I can send A to C?

Translation / English

I bought A on Amazon, but I didnt need it anymore.
Therefore I sold A on Amazon to B.
B's shipping adress was C.
Therefore I am trying to send A to C.
What would be the best way to send A to C?

Translation / English

Though I bought A, I don't need it anymore.
Therefore, when I sold it on amazon, B bought it.
The shipping address of B was C.

So I'm trying to send A to C.
What kind of procedure do I need to send A to C?