Double click on the green Text module box, replace the text (none) "Hello World" (with double quotes). For the font value, you should see "variable". If you want to change the font type, click on the box with "...". Also notice the tabs on the bottom such as "Description" and "Help on Syntax". You may need these to get more detail about the inputs, outputs, and what the module does. The "Expand" button is used in some modules that have many input options. Selecting "Expand" in such modules will list hidden options. The hidden options "direction" and "up" are used to change the orientation of text in an image. After you have explored the buttons click OK.
The OpenDX Executive reads the code and decides if it needs to do
anything. So far, our network produces no output, so executing the
network yields no result and OpenDX does nothing but scan the network
to see if it should do anything.
To complete the program, put an "Image" module below the green
"Text" module and then connect the bottom (output) tab of the "Text"
module to the top (input) tab of the "Image" module.
Execute the program typing CTRL+E
or Execute-Execute Once from the top menu bar. An Image window
will appear with the text "Hello, World" centered in the display.