How do I add items to a wishlist.  I read that if you are waiting for a book to come out you can add it to a wishlist.  But I'm not sure how to do this.  Thanks!

Search for the book you want.  If it is not currently available in the system, you will see a button that says "+ wishlist."  Click that button and it will add it to your wishlist.  If there are other versions of the book linked to that book, it will take you to another page where you can add multiple versions to your wishlist.

If you can find the book listing just click on the +wish list button. If it's not listed but you know the ISBN  (for instance, you saw it on Amazon or an author's website) you can search for it here using that number and the PBS database will usually update after a little while (not sure how long - a few hours or a day, maybe). Somehow the search initiates it being added. When it syncs with whatever sources it uses and becomes a PBS listing you can add it to your WL.

You can't wish list books that are posted into the system. If you are seeing an Order This Book button then there are copies available and you save it some other way until you want to order it like a book list, tag or reminder list.  The reminder list is best for this because it'll tell you how many copies re in the system.
 

Thanks everybody!