Open the Health app
Tap your profile picture in the top-right corner
Tap Medical ID
Tap Edit
Scroll to Emergency Contacts
Tap add emergency contact
Select a contact
Choose the relationship
Tap Done
Tap Done again to save
Open the Health app
Tap your profile picture in the top-right corner
Tap Medical ID
Tap Edit
Scroll to Emergency Contacts
Tap add emergency contact
Select a contact
Choose the relationship
Tap Done
Tap Done again to save