1.) Connect your computer to your device with the USB cable it came with

2.) A drive icon for your e-reader should show up on your desktop if using a Mac, or within your "My Computer" area if on a PC

3.) Open this up, where you should see a folder that holds your book files

4.) Once the file is saved to your computer, drag it inside your e-reader's books folder 

5.) When done, close any e-reader windows open on your computer, and eject the drive icon (don't detach the USB until the eject step is complete)

You should now see the book inside your e-reader, ready to read