Please be aware that there are different versions of the Kindle. Some older models only came with a 3g connection. Others only have WI-FI, and some have 3g and WI-FI.
If you are getting the message that your Kindle does not support WI-FI, you may have a model that has 3G wireless, but not WI-FI. According to Amazon, “Library books cannot be delivered via a Kindle’s 3G connection.” In order to read the title, you will need to download the title to your computer and transfer it via USB to your Kindle. Instructions on how to do this can be found here .
If you believe that you are getting this message and that your Kindle does have Wi-Fi, you will need to contact Amazon for further support. Otherwise, please follow our kindle instructions to learn how to transfer the title from a computer.