Multiple Attempts for Ungraded Text Entry Questions (Survey)

Are you asking for an option for the learner to go back and try again immediately, or are you asking for the option for the learner to exit the course, have you see their answer in the LMS, and have the instructor contact them so they can return to the course and answer again without having to go through the whole course?

If the former, that's pretty simple. See the attached sample. If the latter, that is considerably more complicated.