It kind of depends on what your complaint is in reference to. If it has to do with inmate or visitor issues then the regional director might be the place to start. If it has to do with medical issues I'd go to the Health Services Director. There is also a generic complaint form on the FDOC website where you can state your complaint and they will route it to the appropriate person- here's a link to the complaint form. Whatever you do I'd put my concerns in writing so there's a paper trail. If you make phone calls take notes and be sure to get the person's name you are talking to.