If you haven’t already, turn on the Shopping app from the Apps panel. Instructions can be found here. Then, click the “Shopping” app button on the OneLaunch dock.
To search for an item, simply type what you’re looking for in the search box (shown below) and press “Enter” on your keyboard. OneLaunch will open relevant results in your browser.
To narrow the results, you may limit your search to a specific department. To do so, click on “All Departments” and then choose a department from the shown list.