Board Thread:Skyrim/@comment-104.34.238.74-20150212010245/@comment-26026175-20150212023525

I'm not entirely sure of your situation, have you retrieved the Horn of the Jurgen Windcaller? You have to retrieve that for him to teach you the third word. But assuming you did and it's a bug on the quest,

You can use console commands to complete the quest as learning Dah is the last part of the quest by using "setstage  100". If the next quest doesn't start by itself then use "setstage  10".