title: How to add jar to classpath in IntelliJ?
body: <p>after downloading a .jar file i need to include it in my classpath as the creator says in this page:
  <a href="https://arnaudnouard.wordpress.com/2013/02/02/undecorator-add-a-better-look-to-your-javafx-stages-part-i/" rel="nofollow noreferrer">https://arnaudnouard.wordpress.com/2013/02/02/undecorator-add-a-better-look-to-your-javafx-stages-part-i/</a></p>
  <p>But how can i do it in IntelliJ IDEA?</p>