Install the latest Adobe Digital Editions software. After installation, run the "Setup Assistant" by clicking "Continue." Click the link to "Obtain an Adobe ID Online," if you do not have an Adobe ID. Click "Create an Adobe Account" and fill out the form. Use your Adobe ID to activate your copy of Adobe Digital Editions. Use the same ID to access your eBooks on any computer.
Search your local library website. Many libraries give registered users free access to Adobe Digital eBooks. The eBooks download from the library website and are given an expiration date similar to the expiration date for a standard checkout.
Purchase eBooks online. Several online eBook merchants specialize in Adobe Digital eBooks such as BooksOnBoard and eBookMall.
Download free eBooks from Google. Search Google Books and click on a book that interests you. On the right side of the screen, click "Read This Book." On the right side of the toolbar, click "Download." Click "ePub" if available, or click "PDF," and save the file to your computer. Open Adobe Digital Editions, click "Library," then "Add Item to Library" and find the downloaded eBook.