Responsive Menu not clickable on mobile/resized screen

I’ve installed this plugin to go with my theme but I can’t get it to work, as in fold out on a mobile device or on a resized browser screen. Could you take a look at my site and see what the problem is? I’ve checked the header.php and the footer.php files already and they are being called correctly 🙂 Thanks!

URL: Link to my site

https://wordpress.org/plugins/responsive-menu/