Specific steps:
1. When you want to apply for a national health code, open your mobile phone and click "WeChat", then click the "Search" icon.
2. Open the WeChat search interface to search for "National Government Service Platform", and then click the "National Government Service Platform" applet in the search results.
3. Open the national government service platform, click "Allow" to authorize the use of location information, and then click "Epidemic Prevention Information Code".
4. Open the prompt pop-up window and click "OK", then check the user agreement and privacy policy, and then click "Start verification".