Open the Kindle app or go to Amazon’s Send to Kindle page
Sign in with your Amazon account
Make sure your Kindle device or app is registered to the same account
Find the book file on your device
Supported formats include EPUB, PDF, DOCX, TXT, and some image files
Drag and drop the file into Send to Kindle or upload it from your device
Select the Kindle device or app you want to send it to
Click Send
Open your Kindle device or app and sync it
For email sending, find your Kindle email address in your Amazon account
Add your personal email address to the approved senders list
Email the book file as an attachment to your Kindle email address
Sync your Kindle device or app to receive the book