Normally this step is done when you install Jade. To fix it afterwards, first open the Apple Health App. Go to Data Sources, and choose Jade. Set all data types to Allow. Check that Jade is enabled for Apple Health, under Settings\Health, Dexcom, NightScout\Health. Next, you need to ensure you actually have data in Health. So in the Health App, browse to the data type you are expecting to see in Jade, e.g. carbs or blood glucose. Check that there are values within the last 4 hours.
