I sold an iPad on eBay and can t print the shipping info?

The item sold and I went to the page where you create and print the shipping label, but it would let me. It kept giving me an error saying "Some USPS services are no longer available online to certain countries. If you don t see the service you d like to use, you will need to purchase postage at your local post office." So if I create a shipping label at the post office, how will eBay know if i shipped the package without their own verification through my account like it is usually done? How do i know I won t get scammed and have the buyer say they never received it, since eBay isn t tracking it? Someone please help

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