Whova provides a session-based feedback feature that costs a flat rate of $200 to utilize for your app. If you would like to add this feature to your app, you can add it from the dashboard under Configure App > Survey & Session Feedback and then pay for it via credit card through the dashboard on the "Pay & Publish" page,
After this feature is paid for, every session in your app will have a short survey that can accessed in the form of a "Rate" button. Note this is different from the Survey Links which will reside in the Surveys Resource and cannot be attached to individual sessions.
A reminder as well that individual links can be included in the Session Description of the Session itself in the Session Manager.