Florida has convenient election laws regarding voting by mail. All that is required is a request by a registered voter, and those can be made online, by telephone request or by mail.
Your ballot is then mailed to your address. Simply follow the instructions, make your election choices, and fill out the ballot. Be sure to sign the envelope to verify that you are casting the ballot, mail or return it so that it is received on or before Election Day, and your vote counts.
Last election, a third of the ballots in Florida were cast via vote by mail.