You can download your free ARC Copies here.
There are a few different ways to do this. One of the simplest is to use Amazon’s new Send to Kindle feature, which allows you to email the e-book file directly to your Kindle. Simply look in your Kindle app for its Send to Kindle email address, then use your email client to send the book to that address.
You can also go into the File Manager of your device and move the book from your Downloads Folder to your Android Kindle App. Simply copy the MOBI file from Downloads to Internal Storage>>Android>>data>>com.amazon.kindle, and then the book should appear in the DOCS folder of your App’s Kindle Library.
That’s all there is to it.