Hi bibi!
Well you have it uploaded, as long as it is in a public facing directory it should be fine. Can you access the file from the web?
http://yoursite.com/somewhere/thisfile.pdf ?
If so then you need to simply place the link manually. There is no capability to include it in the category menu. This could be custom coded, but it is not a stock option to include links in the category menu. Perhaps you can explain more what you are trying to do.
