You can resubmit the survey to update your responses. Continue re-submitting as needed until the reviewer closes the survey. You can edit or remove your comments, disagree with items where you previously agreed, and agree with items where you previously disagreed. The reviewer and other contributors can only see responses and comments from your most recent submission.
Note: If you've suggested a new library item on a previous submission, the only way to change your response is to disagree with your own suggestion.