To link the HTML, CSS, and JavaScript files together, you'll need to add references to the CSS and JavaScript files in your HTML file. This can be done using the <link> and <script> elements in the <head> section of your HTML file:

<head>
  <link rel="stylesheet" type="text/css" href="signup.css">
  <script src="signup.js"></script>
</head>

To deploy this form in a way that allows you to record what users enter, you'll need to have a server-side script to handle the form submissions. This script can receive the form data from the browser and store it in a database or send it to an email address, for example.

One way to do this is by using a back-end framework such as PHP, Node.js, or Ruby on Rails. You can write a script in one of these languages to receive the form data and perform the necessary actions, such as inserting the data into a database or sending an email.

Here's an example of how you could handle the form submissions using PHP:

<?php
  if ($_SERVER["REQUEST_METHOD"] === "POST") {
    // Get the form data
    $firstName = $_POST["first-name"];
    $lastName = $_POST["last-name"];
    $email = $_POST["email"];
    $phone = $_POST["phone"];
    $password = $_POST["password"];
  
    // Do something with the data, such as insert into a database or send an email
  }
?>

You would then modify the HTML form to use this PHP script as the action when the form is submitted:

<form id="signup-form" action="process-form.php" method="post">
  <!-- form fields go here -->
  <button type="submit">Sign Up</button>
</form>

In this example, the form submits to a PHP script called "process-form.php". When the form is submitted, the PHP script will receive the form data and perform the necessary actions.

Note that you'll need to have a web server running with PHP support to run the above PHP code. If you don't already have a web server set up, you can use a hosting service or a local development environment like XAMPP or MAMP.
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