The Orders page of your admin view gives you quick access to all of the orders your customers have purchased from you.
To view a single order click View in the order list, which will take you to a details screen for that specific order.
From this detail screen you can see the specific details, such as transaction information, what the customer purchased, the associated customer or guest email, and access to the Receipt.
To modify a Order click the three dots next to View to bring up the Actions dropdown and then choose Edit:
From here you may modify the associated customer or change the guest email on the order.
You may remove an order from the Actions dropdown in the index view by clicking Destroy or by pressing the Delete Order button on the single order view. Clicking either of these will present with you a confirmation prompt, preventing accidental deletions.