After you have successfully built your project, you should be able to run the programs contained within it. Gild makes it easy to run your programs. Just follow these steps:
"Run Project [selected project name]" button on the toolbar.
Your program will now run. Where the output appears will depend on how you've written your program. Normally, it will appear either in the Console view at the bottom of your screen (if you have written an application), or in a small window (if you have written an applet).