Click on the "Start a new Hub" link at the top of the page. After entering the basic information, like the title and category, you are taken to the hub creation page. Here is where you can add capsules to your hub. Each hub starts with the basic text, photo and comment capsules. With the text capsule, you can enter in your review. If you want to enter in an amazon link, add an amazon capsule by clicking on the amazon capsule button in the upper right corner of the page. Once it's placed in your hub you can edit it and it will allow you to select amazon products based on ISBN number or a keyword search.