I am using the Vineyard WordPress eCommerce theme. The main page is here: homemadecanadian.com
Question: You will see the latest products at the bottom, three of them. How can I change them? I want to display different products there.
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Judging by the CSS it looks as if this is being generated by a widget; if you're using the 'Latest Products' widget provided with WP e-commerce the latest/most recently added products will automatically be updated and displayed by the widget.
Check you Appearance => Widget screen and look for the widget there. It should display the options available to you.