How to Hide Captcha for WordPress Admin Menus

function plt_hide_captcha_for_contact_form_7_menus() {
	//Hide the "Captcha" menu.
	remove_menu_page('f12-cf7-captcha');
	//Hide the "Captcha → Dashboard" menu.
	remove_submenu_page('f12-cf7-captcha', 'f12-cf7-captcha');
	//Hide the "Captcha → Log Entries" menu.
	remove_submenu_page('f12-cf7-captcha', 'edit.php?post_type=f12_captcha_log');
}

add_action('admin_menu', 'plt_hide_captcha_for_contact_form_7_menus', 11);

Where do I put this code?