This example has a Result field where the plug-in Results are shown. This is where the plug-in can give you feedback on what it is doing. If an error occurs, it will report the error in the results field which can help you fix any issues you may be having. It will also report its successes so that you know everything is going as planned.
To determine which field contains the plug-in results, look at the script you are using to call the plug-in. The script will contain Set Field script steps which are how the plug-in is called. For example, the "Edit Settings" script contains a Set Field script step that looks like:
Set Field [ POP3it_Messages; POP3it_ConfigureAccount ]
The Target field of the Set Field script step is the "POP3it_Messages" field, which is how the "Result" field is determined as what will hold the feedback from the plug-in.