Unread reviews will be in the "All Reviews" section of the Feedback tab in RevenueWell. Unread surveys will be in the "Your Surveys" section of the Feedback tab.
Click on "View All" underneath the appropriate section.
If a review or survey is unread, its title will be in bold font. Notice the bold font on the last two reviews listed here:
Click on the title of the review to read it. Once you've opened the review or survey, the title will no longer be bold in this list.