How to Hide Media Cloud Sync Admin Menus

function plt_hide_media_cloud_sync_menus() {
	//Hide the "Media Cloud Sync" menu.
	remove_menu_page('wpmcs-admin-ui');
	//Hide the "Media Cloud Sync → Dashboard" menu.
	remove_submenu_page('wpmcs-admin-ui', 'wpmcs-admin-ui');
	//Hide the "Media Cloud Sync → Configure" menu.
	remove_submenu_page('wpmcs-admin-ui', 'wpmcs-admin-ui#/configure');
}

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

Where do I put this code?