To read a PDF, you will need a program that can read that type of file.
The most common is Adobe Reader, but if you don't already have Adobe Reader, you can download it free.
A number of other free programs also exist, such as FoxIt or Preview, and they can also be used to read PDFs.
When you download a file, you can print it out, or just read it on the screen.
If this did not answer your question, please open a new ticket.