Hello again, Sabrina. All of your orders are in the account page, just select the order there and on the order page, there should be a confirm button.

Here are some screenshots to explain how to get to that:
https://imgur.com/a/cae9q

Please note there is no order page in that example, but you can easily see it once you are in the order section. The important thing to remember is to never click on confirm if you are unsure with the order. If you think there is something wrong, click on dispute instead. You are given 72 hours to make a decision with this, and in all those 72 hours, your seller's payment will not be sent yet.