Fla. Stat. § 709.02

Powers of appointment over any property, real, personal, intangible or mixed, may be released, in whole or in part, by a written instrument signed by the donee or donees of such powers. Such written releases shall be signed in the presence of two witnesses but need not be sealed, acknowledged or recorded in order to be valid, nor shall it be necessary to the validity of such releases for spouses of married donees to join such donees in the execution of releases, in whole or part, of powers of appointment.