VMWare networking

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I currently use Parallels 2, but was looking to upgrade to either the newer version of Parallels or VMWare Fusion. I installed the trial for VMF, but I get no network connection. As far as I can tell it's trying to use the wired network card, but I have a wireless network in my house.

How do I specify which network card to share in VMF?

(I have a 24" iMac from last summer if that matters)