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    Tom, I will help you but, before, you need to read Support Policy.
    We do NOT give support for "HOW DO I" questions.
    Anyway, we are here to solve problems and HELP our customers, not for discuss with him.
    You need to add this block in homepage:

    {{block type="catalog/product_list" category_id="3" template="catalog/product/list.phtml"}}

    Hope it helps.