Well, we have at least one Brazilian in our team (perick), so welcome, you are not alone :).
You can try right-click on your project and then choose: 'Export as JAR', and just choose the file name for you file. This will create a JAR with your classes (compiled) in it.
To run it, however, you need to also have all jme *.jar files, and the libraries (under ./lib/ directory). Do you want to run you application from the command line? If so, then the you can use something like this: