The "Field Name" is the name you should use in your Guestbook form.
The "Description" is just that, a description of the field.
The "Required" specifies whether your guest is required to enter data here.

Field Name	Description	Required
FirstName	Your guest's first name	Yes
LastName	Your guest's last name	Yes
Company	Your guest's company name	No
Address1	Your guest's Address (part1)	No
Address2	Your guest's Address (part2)	No
City	Your guest's city	No
StateOrProvince	Your guest's state or province	No
PostalCode	Your guest's postal code	No
Country	Your guest's country	No
EmailAddress	Your guest's email address	Yes
WegPageURL	Your guest's URL	No
HomePhone	Your guest's home phone number	No
WorkPhone	Your guest's work phone number	No
FaxPhone	Your guest's home fax number	No
MailingList	does your guest want to be emailed	No
Notes	Your guest's comments	No