To transfer PDF files from your computer to your Kindle, you will need your Kindle plugged into your computer with the USB cord. You will need to make sure you have administrative rights on the computer you want to work from, so it is best to complete the steps from your personal computer!
Whether you have a PC or a Mac, the directions are essentially the same.
First, make sure your Kindle is plugged into your computer. Open Windows Explorer (or Finder if you are using a Mac) and open the Kindle drive to find the Documents folder. If you have already purchased books through the Kindle store or you've used OverDrive to download books, they will also appear in the Documents folder:
To transfer the PDF file you want to put on your e-reader, you'll need to find where it is saved on your computer. Right-click on the file to copy it. Go back to the Kindle Documents folder and paste the PDF file in the folder. When it has been copied succesfully, you'll see it appear:
That's all there is to it. Safely remove your Kindle from your computer. To get started reading, turn your Kindle on and open your library. You'll find the PDF file listed as a recently added file:
If you're unsure of what e-book format is compatible with your personal e-reader, or if you want to know what devices you can use to read a particular file format, check out the Comparison of E-Book Formats from Wikipedia that details all formats available and covers virtually all devices. Wikipedia is updated frequently, so check back often!