As soon as your jersey is bought, you will receive a notification by email informing you the purchase of your jersey and giving you an appointment on the page "sale" of the site located in the header menu.
It's up to you to send the jersey.
You will have to forward the package so that the buyer can follow the path / evolution of the jersey.
Change the status of the sale to "Shipped" and put the tracking number and the url of the shipping website.
When the user has received the jersey, he will make sure to have received the jersey as it was described in the sale then he will be able to approve the sale and leave an opinion on your jersey.