When I got to the graybeards in skyrim I couldn't shout. I checked the controls and it said to hold down RB but it won't work. It does say that I collected a dragon soul and that I unlocked and learned a shout.
The Elder Scrolls V Skyrim – Why Can’t You Shout at the Graybeards?
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Best Answer
If you indeed unlocked the shout, you probably didn't equip it. Go to the magic menu, and you should be able to see and equip it. When this is done, you should be able to shout at the Greybeards when you hold down RB as you said.