JUST TAP 'EDIT'
Basically, the summary of this quick guide is to tap EDIT for any of your decks that were previously unpublished or edited without having been updated on the web. Going forward, your new decks and any decks you edit will sync automatically when you go to into edit mode, to the Main Menu, or into playback mode. But all of those existing decks should be synced so that you can make sure you've got them all ready to go between the web and your iPad!