How do I add the Cardiogram complication to my watch face?
The Cardiogram companion app for the Apple Watch requires WatchOS 6.2. and above. If you no longer see the app on your Apple Watch, please download the latest version of WatchOS.
The Apple watch face can be customized by selecting different complications. Apple’s instructions for adding a complication to your Apple Watch face can be found here. (Note that not all watch faces allow you to add complications).