How to ensure popup does not come until someone has clicked the messanger

I am using Facebook messanger chat plugin but I want that , How i can help you today message or any other message that comes does not popup until I have clicked on the button. Can anyone assist.

Here is the current code >>

<!-- Load Facebook SDK for JavaScript -->
<div id="fb-root"></div>
<script>
window.fbAsyncInit = function() {
FB.init({
xfbml : true,
version : 'v4.0'
});
};

(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>

<!-- Your customer chat code -->
<div class="fb-customerchat"
attribution=setup_tool
page_id="xxxxxxxxx">
</div>