First, click the "Products" tab to view products:
You can search by name, sku, or category using the "search query" field (try searching "sweater", "jacket", or "hat"!), and by suppliers and price range.
Don't see a product you're looking for? Let us know and we can look into why. In the meantime, you can add a custom item to your project (the only downside is you have to enter pricing and upload an image yourself).