Hello Jean,
I'll try to help you. Not sure what do you mean by submitting your official exam results for the "Exam Feedback", but if you are asking how to use the PM Exam Simulator Live FeedbackTM feature, then it's quite easy: just access your results from "My Statistics" link at the bottom of your homepage (after you are logged into your account), navigate to the "Details" tab, and click the exam you wish to review. Then you select a question from the list, and once the question is displayed, you click the Live FeedbackTM button at the bottom of the page. The rest is very simple: select the "Feedback Category" from the drop-down menu, type in your feedback, and hit the "Submit" button.
Hope it helps.