To buy a certain book that you are interested in:
1. Find the needed book that you are looking for and then click Get book.
2. On the book details page, view the list of the people who you can get it from.
3. Choose the person depending on location, price, or swapping option, and then click Request a book.
4. In the opened window, type a message to the owner, and then click Send request.
After that, both of you can chat and make further arrangements.