Like Bianchigirl said. Brake lever bolts are inside the body, and you often have to remove the cable to access them, though you might be able to slacken it enough to flex it out of the way.
For the ergo bodies, feel the top outside area through the hood, and you'll feel a slight hollow. That's where the bolt is. Gently lift the hood away from the body on the outside and slide a 6mm hex key in, and fish for the socket head bolt. It's best to use a balldriver type key, because you don't always get perfect alignment and the ball head will make easier to engage the bolt.
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