Return labels and return address?

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I'm using Eprolo I have added a few products from their marketplace, and some from aliexpress I only plan on shipping to the US only, but on my analytics I found some international views on my protected page. I contacted eprolo support and they said they will give their return address when a customer requests a return. I have a PO box just for that occasion. My question is on shipping within shopify how should I set up the shipping for instance when a customer wants to return a product, I don't want to put the return address from eprolo I want to use the PO box address and ship it back to them. Also for the shipping labels I want the return address to be from my po box how should I set it up? I'm dropshipping and I'm from the US.