After filling out the FAFSA, you and your parent(s), if parental information is required, must sign and submit the application. If you complete the FAFSA online, you must sign the form with your FSA ID. If you complete a paper FAFSA, you must sign the paper form and mail it to the address listed. The FAFSA will take a few days to process if signed and submitted online. Processing will take longer if you mail in a paper form.