If you haven’t already, turn on the Classifieds app from the Apps panel. Instructions can be found here. Then, click the “Classifieds" app button on the OneLaunch dock.
To find classifieds in your area, simply type your ZIP code into the text box on the left and your search terms into the text box on the right. Press "Enter" on your keyboard and OneLaunch will quickly show you relevant classifieds for your location!