How to Hide Smash Balloon Custom Facebook Feed Admin Menus

function plt_hide_custom_facebook_feed_menus() {
	//Hide "Facebook Feed".
	remove_menu_page('cff-top');
	//Hide "Facebook Feed → Settings".
	remove_submenu_page('cff-top', 'cff-top');
	//Hide "Facebook Feed → Customize".
	remove_submenu_page('cff-top', 'cff-style');
	//Hide "Facebook Feed → About Us".
	remove_submenu_page('cff-top', 'cff-about');
	//Hide "Facebook Feed → oEmbeds".
	remove_submenu_page('cff-top', 'cff-oembeds');
	//Hide "Facebook Feed → Instagram Feed".
	remove_submenu_page('cff-top', 'admin.php?page=cff-top&tab=more');
	//Hide "Facebook Feed → Twitter Feed".
	remove_submenu_page('cff-top', 'admin.php?page=cff-top&tab=more');
	//Hide "Facebook Feed → YouTube Feed".
	remove_submenu_page('cff-top', 'admin.php?page=cff-top&tab=more');
	//Hide "Facebook Feed → Social Wall".
	remove_submenu_page('cff-top', 'cff-sw');
	//Hide "Facebook Feed → Try the Pro Demo".
	remove_submenu_page('cff-top', 'https://smashballoondemo.com/?utm_campaign=facebook-free&utm_source=menu-link&utm_medium=upgrade-link');
}

add_action('admin_menu', 'plt_hide_custom_facebook_feed_menus', 11);

Where do I put this code?