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I believe you are looking for the "Inspector" that was shown in Jim's first image in the original thread over here with the coding at the bottom of the screenshot as seen below.
There are two ways to Inspect and find the source code of your form.
Most browsers you can usually RIGHT-CLICK >>> INSPECT and it'll show them as Jim has shown in his example screenshot above. Doing it this way will vary slightly depending on the browser.
The other way is included in your Formbuilder when you Edit your Forms by finding an empty white area where a field is not and clicking there to view source in a similar fashion. Then just scroll down til you find the fields you need and get the element information that you need.