I've been quite unsure how I receive, or where to get dragon souls from.

I've killed a few dragons in this game already, and everytime I do, I get an ingame message across the top of my screen telling me that
I have absorbed a dragon soul. But I'm very confused.

I already have the ability to use "Whirlwind Spirit," and "Unrelenting Force," becasue I gained use of them from completing a
couple of quests and was rewarded to use them. (ya know, the infamous.... FUS.... DO RAA!)

But along the way, I have also picked up other dragon shouts from variious dungeons. ("Slow time," "Frost Breath," and "Become Ethereal")
I click on them in my magic list to attempt to use 1, but I just get a normal ingame message telling me that I need dragon souls to be able to use and unlock them.

This has really confused me!

If I have already absorbed dragon souls from killing dragons, then shouldn't I be able to use these other dragon shouts?
I just do NOT get it! Why is it telling me this??

How on earth do I get these other dragon shouts to work, (to unlock them) and where on earth do I get dragon souls from?
Please help me anyone????
Edit : I'm playing this game on the X Box 360 if that will help anyone to give me better controller directions.


