Amazon sellers can view their sales in the following ways:

1. Log in to the Amazon seller backend and click the "Sales Report" tab to view various sales data.

2. Select the "Sales Overview" option in the "Sales Report" to view the total sales and number of orders.

3. Select the "Order Report" option in the "Sales Report" to view the details of each order, including order number, order status, order amount, product information, etc.

4. Under the "Performance" tab, you can view your sales ranking and rating, including indicators such as "Buyer Evaluation", "Refund Rate", and "Order Out-of-Stock Rate".

5. Under the "Inventory" tab, you can view your inventory status and sales trends to further understand sales.