1. Looking for a health certificate: First, look for your health certificate to ensure that you have a valid health certificate.
2. Find the serial number position: on the health certificate, find the serial number position. The number is usually displayed in a specific area of the certificate, whether it is the front, back or specific column.
3. Read the instructions carefully: there are instructions or instructions on the health certificate. Read them carefully and follow them. The instructions will provide specific requirements on how to fill in the number.
4. Fill in the number accurately: according to the instructions on the health certificate, fill in the number accurately in the corresponding field or form. Make sure the handwriting is clear and avoid mistakes or changes.
5. Check the accuracy: After filling in the serial number, check it carefully to ensure the accuracy of the serial number. Compare it with the original number on the health certificate to make sure it is correct.