How to Hide the "Nelio A/B Testing" Admin Menu

function plt_hide_nelio_ab_testing_menus() {
	//Hide the "Nelio A/B Testing" menu.
	remove_menu_page('nelio-ab-testing');
}

add_action('admin_menu', 'plt_hide_nelio_ab_testing_menus', 1000);

Where do I put this code?