When you first start Outlook Express, you see a folder list on the left and a message or contents list on the right. In the screenshot below the Inbox is highlighted on the left. Therefore the contents of the Inbox are displaying on the right, in this case a welcome message.
 
To setup your POP email account we will need to be in a different area of the program. Click "Tools" in the picture below and you will be taken to the next step of the tutorial.