In the screen on top of THE SWEX, click on Orders. In this screen all Buy and Sell are listed. 

On top of this screen, you can see all active buy and sell orders including the amount of articles. The amount between brackets and the check mark, are the amount of articles that have been executed. In the example below, there are 6 outstanding article orders where none of these 6 has been completed yet. When a buyer or seller meets your desired price, the order will be completed automatically and you see the status of this process in this screen.