What type of paper is this and how should I input it into JabRef?
This looks like a conference paper to me, so "InProceedings" is appropriate.  

The one you thought of, "Proceedings" is for the entire conference.  i.e. the book that contains every single paper from the conference, not just a single paper. That's why there is no author field, and the title field is for the name of the conference.

BTW, definition of the categories is here: https://en.wikipedia.org/wiki/BibTeX