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Open your iPhone's settings.
Then scroll down until you 'Health' see and select it.
Then press 'Medical ID'.
If this is your first time creating a Medical ID, press 'To work'.
If you already have a Medical ID and would like to change it, press 'Change'.
Enter your details now.
When you're done, you can also add contacts who will receive a message in case of emergency.
After ending an emergency call, your contacts will automatically receive a message from the iPhone. Unless you cancel it yourself.
Below you will find an instructional video on how to set up your Medical ID.
This video is only available in English, but it is possible to turn on subtitles.