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Search on the book either by title or ISBN. When the book description comes up, there will be a button on the page that you can click to add that book to your WL. Keep in mind that there may be multiple versions under different ISBNs for any given book title, so you may want to WL more than just one version. If you search by title, you should get a list of all versions in the system. Make sure to search on "All Books" or "Wish List Books", not "Available Books". Check out the Help Center for more information- it explains how everything works here. Welcome to PBS!