How to Hide the "Click2Call Twilio" Admin Menu

function plt_hide_click_to_call_for_twilio_menus() {
	//Hide the "Click2Call Twilio" menu.
	remove_menu_page('twt');
}

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

Where do I put this code?