If the emergency SOS was enabled on the Huawei smartphone, an emergency contact was added immediately. Additional contacts can be added at any time.

Note: Up to three emergency contacts can be added.

Android 10 | EMUI 10.0
Step 1:  Open the  Settings
Step 2:  Tap on  Security
Step 3:  Tap on  Emergency SOS
Step 4:  Tap on  Emergency contacts  to add up to three contacts
  1. Open the Settings
  2. Tap on Security
  3. Tap on Emergency SOS
  4. Tap on Emergency contacts to add up to three contacts

Huawei Instructions