Form 102 serves as a contract between you and your Principal at work. It becomes binding only when its Franked.Franking is nothing but converting it into a Non Judicial Paper. So u'll be filling in your name, your articleship period and other details and you and your boss(principal) will sign it on each page and at the end. It need not be sent to the institute , one copy is for you and another for your Principal .Nothin to worry..And while filling the form if you have any query , just see the form filled by old articles. The record will be with your Principal or ask your seniors.