After you’ve ordered an item from a third-party seller on Amazon, you can rate them to let other customers know about your experience.
To leave feedback for an order:
Note: It can take up to 3 days after the order is completed or canceled for the “Leave seller feedback” button to appear next to the order in Your Orders page. You have 90 days from the date of your order to leave your rating and comments. In general, if you buy an item from third-party seller, it may take a longer time for you to receive your package, because the item is not fulfilled by Amazon FBA.