How do i add emergency contacts?

This is because the contact card does not have a number or they're synced to your Facebook contacts. Here's how to add a grayed out contact as an emergency contact in the Health app:

1. Open the Phone app on your device and select Contacts.
2. Tap the name of the person you want to add as an emergency contact on your Contacts list.
3. Scroll down to Linked Contacts then tap the iCloud tab.
4. Tap "Use This Name for Unified Card" and that person will no longer be grayed out in the emergency contact section of your Medical ID.