Understand String Immutability123

Tell us what’s happening:
i m stuck here

Your code so far

// Setup
var myStr = "Jello World";

// Only change code below this line

 myStr[0] = "H"; // Fix Me
 myStr= "Hello World";

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36.

Link to the challenge:

As you have left this in your code you are getting the error that this is not something you can do with string