Adding external library Vaadin Framework from local disk using Netbeans

I want to add an .jar file to my new vaadin project. I found a answer to a similar question, however, it says to look up in google the coordinates for the library your are going to add (here's the link to the similar question: Netbeans adding external libary Vaadin Framework). Yet, the external library I want to use is on my local disk. How can I add it to my new vaadin project?