Visit the FAFSA website to sign up for a personal identification number, or PIN, if you don't already have one. Use your PIN to access your FAFSA information online.
Click "Make Corrections to a Processed FAFSA" located on the menu to the left. Provide your Social Security number, PIN, first and last name and date of birth for verification. You will have to create a new password.
Update your FAFSA by following the online prompts. Type in all the information you need to update. Save your changes after you finish.
Complete and submit a paper application if you don't want to update your FAFSA online. Download an application or visit your school's financial aid office to request a copy. Send completed applications to the Federal Student Aid Programs Office. Contact the financial aid office to tell them you have submitted an updated application.