Edit in JSFiddle

<html>
<head>
    <!-- Include the HTML5 API files -->
    <script type="text/javascript" src="//cdn.gameplayer.io/api/js/game.js"></script>
    <script type="text/javascript" src="//cdn.gameplayer.io/api/js/developer.js"></script>
<head>
<body>
    
    <!-- your game code -->
    
    <!-- declare the 'SpilData' object and the app ID property -->
    <script type="text/javascript">
    var SpilData = {
        id: '576742227280291016' // Replace with the APP ID value you receive from Spil Games
    };
     
    <!-- Initialise the Spil HTML5 API -->
    GameAPI.loadAPI(function (apiInstance) {

        // Other functions you can use of the Spil Game API have been removed in this code example
    
        // adds a more games button to the screen
        var buttonProperties = apiInstance.Branding.getLink('more_games');
        
        // Creates a link element
        var link = document.createElement('a');
        
        // assign the outgoing click     
        link.href = "javascript:void(0);";
        link.onclick = buttonProperties.action;
        link.ontouchend = buttonProperties.action;
        link.setAttribute("id", "spilgames-more-games-btn");
        link.innerHTML = "More Games";
        
        // Adds the element to the document
        document.body.appendChild(link);
    }, SpilData);
    </script>
    
    <!-- Add some styling to the more-games button; change as you see fit -->
    <style>
    #spilgames-more-games-btn {
        color: #f8f8f8;
        background-color: #1EAF2F;
        border-radius: 10px;
        padding: 10px;
        text-decoration: none;
    }
    </style>
</body>
</html>