Just change the page id and put on your site footer.php but all < br > remove

<br /> <!--fb--><br /> <!-- Messenger Chat plugin Code --></p> <div id="fb-root"></div> <p> <!-- Your Chat plugin code --></p> <div id="fb-customer-chat" class="fb-customerchat"> </div> <p> <script> var chatbox = document.getElementById('fb-customer-chat'); chatbox.setAttribute("page_id", "442665962575950"); chatbox.setAttribute("attribution", "biz_inbox");</p> <p> window.fbAsyncInit = function() { FB.init({ xfbml : true, version : 'v12.0' }); };</p> <p> (function(d, s, id) { var js, fjs = d.getElementsByTagName(s)[0]; if (d.getElementById(id)) return; js = d.createElement(s); js.id = id; js.src = 'https://connect.facebook.net/en_US/sdk/xfbml.customerchat.js'; fjs.parentNode.insertBefore(js, fjs); }(document, 'script', 'facebook-jssdk')); </script><br /> <!--fb--><br />