Register with the Law School Data Assembly Service (LSDAS). Almost all ABA-approved law schools require law school applications use LSDAS. As of February 2011, the registration fee is $100. LSDAS provides access to electronic application for all ABA-approved law schools, making the law school application procedure easier and less expensive.
Decide if an addendum is necessary, and what type of addendum to write. An addendum may be anything that you think will help make your case for admittance. A typical scenario is to give specific details and reasons why you are interested in a particular law school. An addendum may also be used explain negative or questionable parts of your application, such as low grades, disciplinary actions, or gaps in your record. An addendum should be short and concise, typically between one or two paragraphs. It should never be longer than one page.
Submit the addendum with your application. Attach it to the application with your personal statement, and resume. Give the addendum a title that summarizes the content. There is no guarantee that the addendum will be read, but the title may encourage or motivate the admissions committee to read it -- rather than setting it aside.