I found the greybeards and they want me to demonstrate a dragon shout. Problem is, I can't equip the shout. I equipped to one of my mouse buttons and used it earlier, when asked, after killing the dragon by Whiterun. Now I just get an empty indicator arrow when I select the shout with either mouse button. I've Googled this repeatedly with no success. Admittedly, I'm a new player at this game(4-5 hours), but key assignments shouldn't be this difficult...reassigning keys was so nightmarish that I had to set this game aside for half a year...

What gives? Is there some simple answer I'm missing, like a recharging limitation, or is this borked game code?


Edit:
Nevermind...I found my answer on yet another Google search.