How to Hide the "ByConsole Cus Greeting" Admin Menu

function plt_hide_byconsole_greetingcard_menus() {
	//Hide the "ByConsole Cus Greeting" menu.
	remove_menu_page('byconsole_cus_greeting_settings');
}

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

Where do I put this code?