Firebase DB - How to update particular value of child in Firebase Database

Question

I want to update my display name in the code below. How can I update displayName?

My database structure is:

-Users
      -KUanJA9egwmPsJCxXpv         


        

Answer 1

How to check whether it's updated or not?

Answer: https://stackoverflow.com/a/44123067/3156040

I was looking for that as well.