If you haven't already, you need to apply online for an FSA ID. Your FSA ID serves as your electronic signature. Your FSA ID will be available at the time of application so you can use it immediately to electronically sign your FAFSA. You will use your FSA ID to sign other financial aid documents, check the status of your FAFSA, make corrections and check your loan history.
It is important for students to file the FAFSA as soon as possible starting in December, because some aid is awarded until funds are exhausted.