look at the Source code in the window on the right

you should see a public class Demo that was automatically created

the line of code, System.out.println$("$Hello Word!"$)$; will display Hello World in the output window, when you run the program

run the program by clicking on the green arrow under Tools, at the top of screen

look in the Output window at the bottom of the screen

you should see BUILD SUCCESS!

scroll up and you should see Hello World!

time to change the code:

in the Source window, change Hello World to Mass Bay Rocks

run the program; check the output window; it should say Mass Bay Rocks now