Change in Name or Party Affiliation
If you
change your name by marriage or other legal process, you must provide
notice of such change to the Supervisor of Elections using a signed
voter registration application.
If you are registered and would like to change your party affiliation,
you must do so prior to the books closing. To change your party
affiliation, you must provide the notice of such change to a voter
registration official using a signed voter registration application.
http://election.dos.state.fl.us/RegToVote/regform.shtml