If doumentation does not cover your questions or have more to ask / share with other product users or get reply from Official Support then feel free to ask / share on CodeShop Amazon Affiliate plugin Forum.
Search on Different Product Categories
When you are searching product then you can search products based on amazon available category. Amazon has different available product categories on different locales, so based on your country you have been associated with amazon that locale's all available amazon product categories you can search on to get your results. Below image showing the sample screen you should see when you will search products -
When you will use 'CodeShop' button to search and add products with your Wordpress regular posts or pages then you will have the almost same window shown in image below -