Login to InnGenius
Go to Front Desk Tab, Click on the Reservation that you need to do a refund for (example shown below) Click on the Payments button
To Void the payment (made in cash below), click on the Void/Refund button and press Close, then Save changes on Reservation screen
This then brings the balance back on the reservation screen. Press Save and close.
Note: If you wish to do partial refund, simply void/refund the whole amount and then press payments button and add the remaining amount as a payment received.