1. Open the health application and select the Health Data tab.
2. Click the "Profile" icon in the upper right corner.
3. Scroll to the bottom of the page and find the "Health Records" section.
4. Click the Add Data button and select the type of health record you want to add.
5. Click the "Save" button, and your health record will be saved in your health certificate.
Please note that the health certificate of Apple mobile phone needs the digital signature of your doctor or medical institution to ensure the authenticity and accuracy of your health record. Therefore, before obtaining a health certificate, you need to contact your doctor or medical institution to obtain a digital signature.