Adding lookup engines in Firefox

When I click on "locate" and elect "manage lookup engines" in Firefox, a window opens with instructions for adding lookup engines: Go to the site you want to add, click on "add" in the Firefox search bar.

When I try to do this I don't find an "add" option in the search bare.

I have FF 6.02 on a Macbook with OS X 10.6.8.

Thanks.

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