Watermarked ebooks are delivered in their original format. One can read watermarked ebooks with any software or device supporting the file format indicated in the book information page.
E-books can be used with most of the e-reader devices currently available in the market. Please check from here whether your device is supported by Adobe Digital Editions.
If your device can be found in the list, you can borrow e-books to it by using a computer. Make yourself an Adobe account. Please note that your Adobe ID is the e-mail address you're using when registering.
Go to Adobe's pages and download Adobe Digital Editions -reader software. Install the software for your computer and authorize it with your Adobe ID.
Connect your e-reader to your computer and open Adobe Digital Editons on your computer. The e-reader will show up in Adobe Digital Editions, and after that you are able to transfer books into e-reader by dragging the book icons from Adobe Digital Editions on top of the e-reader icon. For more detailed instructions, please see your e-reader manufacturer's pages or instructions that came with your device.