Well, your initial enrollment period begins three months before your 65th birthday, includes the month you turn age 65, and ends three months after that birthday.
So all I need to do is to finish and submit my application?
Yes, that's correct. Once you're done, just select Submit Now to send your application to Social Security. You will receive a receipt online for your application that you can print and keep for your records and you can check the status of your application online.