To run Xerlin, simply double-click the Xerlin.bat application if you're on Windows, or run the Xerlin.sh shell script on UNIX (you may need to make it executable first). You can also start Xerlin from a command prompt with java -jar Xerlin-1.2.jar. The Xerlin splash screen should appear, and begin loading the application. If any major errors occur during startup, some kind of error message may appear in the command prompt terminal window.
If this starts up and gives you a blank window with menus at the top, you have successfully installed Xerlin. The next chapter will get you started in using Xerlin to create and edit XML files.