You can download a copy of the Commission's complaint form at the bottom of this webpage. Pursuant to Rule 2B-1.0025(4), Florida Administrative Code, your complaint must meet the following criteria in order to be considered legally sufficient.
The complaint alleges a violation of Chapter 104 or 106 or Section 105.071, Florida Statutes;
The complaint was made under oath in the presence of a notary public or other person authorized by law to administer oaths;
The complaint contains the original signature of the complainant;
The complaint contains specific facts upon which the complainant bases the allegation of a violation of law; and
The complaint alleges a violation that occurred within two years of the date the complaint is filed with the Commission.
When completed, mail the complaint with your original signature to: The Florida Elections Commission 107 West Gaines Street Suite 224, Collins Building Tallahassee, FL 32399-1050.
http://www.fec.state.fl.us/FECWebFi.nsf/pages/Complaints