I have a moto Droid but gonna try to help you figure it out. On mine, 3g is enabled by default. As far as connecting to your wifi, go to menu>settings> wireless & networks - make sure that your wifi box has a check beside it. If it does, go into your wifi settings, scan to see if your phone can pick up the network your trying to pick up. If it does, press on it and select connect.
But as I said, I have a moto Droid, this method may not work on your hero. I hope this helps.
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