How to use Riverty Back in Flow Do you have questions regarding the log-in, your reference number or your PIN? Here, you can find all the information on how to operate and use Riverty Back in Flow. How does the login to Riverty Back in Flow work? How do I get the PIN? My reference number is wrong. What can I do? I have misplaced my log-in data (reference number). How can I access my Riverty Back in Flow profile now?