I'm very stuck any help?

Modify the data stored at index 0 of myArray to a value of 45.

myArray should now be [45,64,99].

You should be using correct index to modify the value in myArray.

my code below:
// Example
var ourArray = [18,64,99];
ourArray[1] = 45; // ourArray now equals [18,45,99].

// Setup
var myArray = [18,64,99];

// Only change code below this line.
var myArray = [45,64,99];
myArray[0] = 24;

You’re changing it to 24, not 45:

// Only change code below this line.
var myArray = [45,64,99];
myArray[0] = 24;

Thank you I have passed the challenge