Editing the CSS File in a Start Bootstrap Theme

I recently downloaded the Creative Theme from Start Bootstrap Theme and I want to edit the creative.css file. However the changes don't show on index.html. Why?

<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="description" content="">
<meta name="author" content="">

<title>Creative - Start Bootstrap Theme</title>

<!-- Bootstrap Core CSS -->
<link rel="stylesheet" href="css/bootstrap.min.css" type="text/css">

<!-- Custom Fonts -->
<link href='http://ift.tt/1iRqzRT' rel='stylesheet' type='text/css'>
<link href='http://ift.tt/290O90o' rel='stylesheet' type='text/css'>
<link rel="stylesheet" href="font-awesome/css/font-awesome.min.css" type="text/css">

<!-- Plugin CSS -->
<link rel="stylesheet" href="css/magnific-popup.css" type="text/css">

<!-- Custom CSS -->
<link rel="stylesheet" href="css/creative.css" type="text/css">

<!-- HTML5 Shim and Respond.js IE8 support of HTML5 elements and media queries -->
<!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
<!--[if lt IE 9]>
    <script src="http://ift.tt/1fK4qT1"></script>
    <script src="http://ift.tt/1knl5gY"></script>
<![endif]-->