Значение строки Hello World

JavaScript
please help me!!
I can’t understand what I could have written wrong in two words: Hello world.

// Setup
let myStr = "Jello World";
myStr = "Hello World";
// Only change code below this line
myStr[0] = "H"; // Change this line
// Only change code above this line

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.5005.63 Safari/537.36

Challenge: Understand String Immutability

Link to the challenge:

If you look at the original starting code for the challenge, it shows you exactly which line you should be changing. Change the line specified and do not add or modify code on any other line.

thank you!! I understand everything.