As you know, adding SEO to your author website is very important. If you don't know what SEO (Search Engine Optimization) is or why it's important, read about it in Search Engine Optimization: Basic SEO Tips Every Author Website Needs. Read more to learn about every place you can add SEO to your Pub Site author website to increase visibility and traffic.
You can add the bookseller buttons for a book by going Titles/Products, selecting the Book, and going to the Purchase Links tab. Here, you can copy and paste links of the book page from the book seller's site.