I made a form with Google Form Builder, then I add a script for it.
I can run Session.getEffectiveUser().getEmail() to the respondent\'s email address. but I cant fi
You can't dynamically modify Google Forms by attaching a script to the Form. See a recent question I asked to get a better understanding.
Basically, you can only use Google Apps Script to create forms in an automated manner. You can't set values for the items as of yet (I certainly hope they add this in the future...).
You can also see the limitations for Forms by looking at the documentation (TextItem, for example).