Understand String Immutability. what i am doing wrong?

Tell us what’s happening:

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:

Your Browser User Agent is: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:55.0) Gecko/20100101 Firefox/55.0.

Link to the challenge:

Technically what you have does solve the challenge. The test which runs behind the scenes still sees the original line ( myStr[0] = “H”; // Fix Me) as a problem, so can either comment it out or delete it all together