You must first install the free reader as referenced above. It is very simple and the Adobe site has extensive information about their product.
After downloading, find the file (while on or off-line) and open it. The reader software will automatically be opened to display the document.
If you have trouble finding the pdf, try " find files or folders" on your Start Menu, type *.pdf in the named box. Click find now and all of the pdf files will be listed.