To qualify for these services you have to fill out a short application that needs to be signed by someone (librarian, doctor, social worker, etc.) that can attest to your visual impairment. Once you are approved they will begin sending you books/tapes through the mail. When you are finished with a book, you simply return it in the postage-free envelope that they provide. This is a wonderful program and I encourage you to take advantage of it. The application can be found on the NLS website, or, in most cases, you can also get an application at your public library.