Adding Onclick to Button

Hi!

Not possible without deeply editing the theme files, i’d suggest the following:
1. Enable this.
2. Set a custom class to that button (ex: custom_click): http://screencast.com/t/1kkB01lkLPs
3. Add this to your theme / child theme functions.php:

function trigger_func_on_custom_button(){
?>
<script>
(function($){
    $(window).load(function() {
    	$('.custom_click').on(function(e){
              e.preventDefault();
              ppsShowPopup(100);
        });
    });
})(jQuery);
</script>
<?php
}
add_action('wp_footer', 'trigger_func_on_custom_button');

Regards,
Josue