If you are just looking to populate an element with the return from two prompts i think this will fit your needs.
function greeting() {
var firstName, lastName;
firstName = prompt("Enter your First Name");
lastName = prompt("Enter your Last Name");
var greetingDiv = document.getElementById('greeting');
greetingDiv.innerHTML = firstName + " " + lastName;
}
greeting();
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solved How do I relay First Name to the right of Hello after a user enters it? [closed]