How can I add a PDF to my form

You allow me to upload .jpg, or .pngs.    But I need to upload a .pdf onto a form.  I found a widget that I can add for the end user to upload a .pdf, but I cannot without having it hosted somewhere on the internet?

It is not possible to host files directly from the form.  If the file is hosted elsewhere, you can, however, add a link to the file in the form or display the PDF directly.  Both can be accomplished using a "Text" field:

http://www.jotform.com/help/153-How-to-Display-a-PDF-Document-On-Your-Form