Updating Samsung note 2 to android 4.4

My galaxy note 2 works on version 4.3, Some time ago it started pinging me continuously about upgrading to 4.4. I wasn't ready to do the upgrade then, so I managed to stop getting the notification every three hours. I would like now to do the upgrade, but when I click on updates as explained here: http://www.samsung.com/us/support/faq/FAQ00050889/56008/SPH-L900ZWASPR nothing happens. How can I upgrade my galaxy note 2 to the latest Android version available for the device? thanks,