Hello !

The prompt(message) method opens a pop-up dialog with message displayed and waits for the user to enter information into the text field of the pop-up window.

By adding a <span> element to the heading like this:

<h1>Hello <span id="name"></span>! </h1>

And then putting the following little two line script at the bottom script:

let userName = prompt("What's your name? ");
document.getElementById("name").innerHTML = userName;

The will ask (prompt) the user for their name, and then put a personalized hello message to them in the heading.