How can I add surveys for each session?

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 > 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 be accessed in the form of a "Rate" button. 

A reminder as well that individual links can be included in the Session Description of the Session itself in the Session Manager.