How do I use my Racial Power?
Solution 1:
To unleash your awesome racial powers, first go to your magic menu. Then, select your power. Finally, unleash it with the Z key . The Z key is also the key that shouts are mapped to, so you can only have one shout or racial selected at a time.
Console equivalents are RB on the Xbox 360, and R2 on the PS3.
Solution 2:
When playing on an xbox with the Kinect you need to depress both the LB and RB.
Solution 3:
The shout is mapped to the Z key (on some keyboards like the german one, it's the Y key), you don't need to equip it onto a specific hand. You do however need to activate a shout by absorbing a dragon soul, if you haven't done so yet.