I apologize that you can't use the send to Kindle option for Designing Interfaces, 2nd Edition . It turns out that this ebook is over Amazon's file size limit, so it can't be sent to your Kindle this way.
You can put this ebook on your Kindle by downloading the ebook to your computer, connecting your Kindle to your computer with a USB cord, and moving the file into the Kindle's documents folder. If you have questions about this, you can find more information on Amazon's help page.
We appreciate you writing us about this, and I'm sorry that this wasn't an ideal experience. I have put an ebook free of charge into your account so you can try out the send to Kindle feature. I have e-mailed you the download links to that ebook.
Customer Service Representative