After you completed the setup process, you can place a test order for the product. Go to Vendor Control Panel > Account Settings > Order Settings and set Apply Short Order Form as "No". Then open the shopping cart link in your browser to place an order for the product. You need to fill in your contact details and click the "Order Now" button.
After placing the order, you should be able to see the order in Vendor Control Panel > Manage Orders under the Confirmation Page status. Click on the order ID to go to order details page and you are allowed to manually process the order. Set the order status to Completed and submit the change, the order is processed by the system.
You should check your emails for the results.