On checkout, buyers are prompted to provide some necessary information such as name, email, shipping address, etc. While Name and Email Address are always required by the cart, users may add any number of additional fields or remove fields they find unnecessary. This is accomplished from within the Additional Fields page under Settings.
The Title appears on the transactionless checkout form. The Name field is used internally to save the value - leave this blank to have it created automatically from the Title. To make a field mandatory, set Required to yes, and provide an Error Message to display when a customer attempts to checkout without completing the field.