You can add your favorite tokens to the scrolling ticker from any Market page.
Each pairing will have a star icon to the left of it. Clicking this will favorite that pairing and it will be added to the scrolling ticker in the order that you clicked them. Click it once more to remove the pairing from the ticker.
Below you can see two pairs. In this example, ETH-BTC is marked as a favorite and will be displayed on the ticker.