On a computer, open and save the pdf file.
When asked to name the file, use the name you want to show up on your Kindle document list.
Connect your Kindle to your computer using a USB/mini USB cord.
Go to the File Manager and find the saved file, then drag and drop the file into the Kindle Documents folder.
Eject your Kindle by right clicking on the Kindle drive then choosing Eject from the list.