From the App menu, hover over the "Showcase" icon and click "App Settings"
Select the order in which you want your items to appear.
Choose a title for your page like, "Press" or "Friends"
Choose whether or not you would like to show icons for links and images, have a drop shadow, and what text you would like to appear as your links, and image downloads.
On the left side, you will have a set of bars with item numbers. When you click on a bar, you will have options for the first item you would like to add. Follow the form to enter the information for your item like a title, description, link or image, and don't forget to save frequently.
For more information on the Showcase Application view our Marketplace.