How to Hide the "Drip Funnels" Admin Menu

function plt_hide_drip_funnels_menus() {
	//Hide the "Drip Funnels" menu.
	remove_menu_page('drip-funnels');
}

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

Where do I put this code?