How to Hide the "2Performant Link2" Admin Menu

function plt_hide_2performant_link2_menus() {
	//Hide the "Settings → 2Performant Link2" menu.
	remove_submenu_page('options-general.php', '2performant-link2');
}

add_action('admin_menu', 'plt_hide_2performant_link2_menus', 11);

Where do I put this code?