How to Hide All-in-One Event Calendar by Time.ly Admin Menus

function plt_hide_all_in_one_event_calendar_menus() {
	//Hide the "Time.ly" menu.
	remove_menu_page('timely');
	//Hide the "Time.ly → Sign In" menu.
	remove_submenu_page('timely', 'timely_signin');
}

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

Where do I put this code?