On the final step of the booking process you have the ability to add in some additional terms and conditions the customer needs to agree with.
You can add in your text for the T&C's from the link below. Once on the screen simply click on the 'Add Text' button in the top right hand corner of the screen.
In the pop up that appears you can type or copy in your text. Note there is a limit on this text field of 4000 characters, if your T&C's is longer then this you can chop the text up into chunks and add an additional T&C entry they system will join them together.
Once you have added your text you just need to turn on the feature in the settings, you can turn on the feature using the first setting, and make it mandatory that the customer clicks on the Agree checkbox, you can also customize the text that appears next to the checkbox.