Amazon will charge you $.15 per MB sent by email to your Kindle. Before you can email items to your Kindle you must authorize access by WebScription.net. Login in to your Amazon Kindle account at

Amazon Kindle Manger

and in
"Your Kindle approved e-mail list"
add the address

@webscription.net

You only need to do this once.

Then enter the address for your Kindle device here and click "Send"