If you are looking to send a PDF document to a Kindle then you will need to download the free Adobe Acrobat reader. The free reader is not compatible with the Kindle and will only work with an Adobe reader for PC. It also has a very limited number of features so that you can do only what is on the screen. The Acrobat reader for Windows however is the same as the free reader so all that you need to do is to download the free reader and use the same program on your computer to send to your Kindle.
After you have downloaded the free reader, open the program and follow the instructions to install it. After that you should be able to read the PDF files on the Kindle. You will need to download the Adobe Acrobat reader application and it is available for free in the Windows section of the software store. It should have already been installed so all you have to do is to run the program to start sending the PDF file to your Kindle. If you are wondering if you can send other files to your Kindle then this is also possible with the application.