How to Hide Events Manager - Events / Locations Slider Admin Menus

function plt_hide_stonehenge_em_slider_menus() {
	//Hide "Stonehenge".
	remove_menu_page('stonehenge-creations');
	//Hide "Stonehenge → EM - Events Slider".
	remove_submenu_page('stonehenge-creations', 'stonehenge_em_slider');
	//Hide "Stonehenge → Free Forums".
	remove_submenu_page('stonehenge-creations', 'stonehenge_forums');
	//Hide "Stonehenge → Add-ons".
	remove_submenu_page('stonehenge-creations', 'stonehenge-plugins');
}

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

Where do I put this code?