How to add Emoji in HUD?

You have emoji in HUD string in GameHelper.swift file. How do you add different one? I found this book very helpful and easy to understand and am already working on my own simple game. I am eagerly waiting for your response. Thank you very much!

Guys, I got it. It is under Edit menu of Xcode. But still don’t know how to add my own custom emoji. If you guys know, please let me know. and meanwhile I also researching and studying to find out. Thanks!