First, you must ensure the app is connected to your wheel. This can be checked by going to the "Settings" tab. The first option should read "Disconnect" while you are connected to a wheel. Also, the wheel icon in the upper right of your screen will be a solid color (versus greyed out while not connected).
To record, navigate to the "Map" tab and press record. The button should then turn to read "Stop". Press this once you are completed with your ride. Recorded rides will then be viewable in the "History" tab.