Terms & Conditions – how to describe winning odds

The client we are using this for is very concerned with writing suitable terms and conditions for the spinning wheel, explaining exactly how winners are calculated and what the chance of winning is. I know we can set the percentage chance of winning for each prize, but is there any additional info available for exactly how winners are calculated that can be included in a T&Cs page? I don’t see any terms included on your demo and nothing like this in the docs. To meet legal requirements it’s very important that it’s clearly stated. Any clarification you can give would be greatly appreciated.