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Although I personally haven't done it, I believe that a section called "build product link" will help you build a link to a product.
Also, you can build the link yourself, there is a general scheme Amazon uses for affiliate links, and there's a little helpme on that too in the associate section.
I've found the best way to promote individual items is using the following link structure:
Simply replace the appropriate spots and you have your direct link.
The reason I use ref=nosim is because this creates a link directly to the product page (JUST the product) instead of a page with the product and "similar products." Given the bonus you get for direct linking (i.e. they buy the product in the link), I find it's worth it to keep as little as possible between them and the product I'm referring.
Hope that helps. :)