Hi there ... what Chris is telling you is correct ...
To insert a link in those chosen words you wish to use, you do so in the very same fashion that you make any text link ...
Highlight your line of words, choose insert, choose link and type in the link ... in this case the link for the pdf ... which would be ...
http://www.nameofyourdomain.com/nameofpdf.pdf
Use the extension .pdf for this file ...
You can give your users directions for download, you could say, to save this pdf as a download, right click and save target as ... clicking the link will open the pdf, where the user can also choose to go to file, and save as ...
Hope this clears things up for you ...
I just notice you have your pdf file called pdf -
so you link would be
http://www.nameofyourdomain.com/pdf.pdf
You might consider giving your pdf a new name and reuploading it ... just to identify it in the chance that you may have 1000 pdfs ... remember when renaming though, all small letters, no capitals and no spaces unless joined together by the _ underscore symbol ...