1. mvn jrebel:generate

  Generates rebel.xml configuration file to src/main/resources

2. One the maven project in your favorite IDE
   In Eclipse: Import -> Maven project
   In IntelliJ IDEA or NetBeans: open as Maven project

3. Start the application container with -javaagent:/path/to/jrebel.jar
   Or the IDE does it for you automatically.

done.