First of all, Kevoree new wizard only work when a source repository is selected.
So naviguate to
src directory of your project (plain Java or Kevoree) for instance and right click on it.
Additionally, each squeleton of Kevoree entity generated by the plugin contains Kevoree API usage example. Thus, do not hesitate to use them if you do not remember the API to access Models@Run.time for instance.
KevScript files describe a boot file. In other words, how to define and run a Kevoree the easiest way is to define such file and run it using runnner of the next sub-section.