How to Hide SC Simple Zazzle Admin Menus

function plt_hide_sc_simple_zazzle_menus() {
	//Hide the "Simple Zazzle" menu.
	remove_menu_page('simple-zazzle');
	//Hide the "Simple Zazzle → Simple Zazzle" menu.
	remove_submenu_page('simple-zazzle', 'simple-zazzle');
	//Hide the "Simple Zazzle → Add New" menu.
	remove_submenu_page('simple-zazzle', 'simple-zazzle-edit');
}

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

Where do I put this code?