Do you know if one was ever issued in your name for this vehicle and maybe you never received it? I'm in NY so I really can't help you concerning forms from the Florida DMV, but I wanted to ask if you had the correct form in the first place? In my state there is a form to obtain a duplicate title but I don't believe they ask for both the seller and buyer's signature , just the vehicle's owner's info and a place for their signature. that what made me think if you had the right form.
EDIT: I came across this form online from the Florida DMV website and think this may be the form that is required,( Not exactly sure, if someone else knows, they can let you know.)
http://www.flhsmv.gov/dmv/forms/BTR/82101.pdf It is form #MS72, and if it is the form you have, my thoughts would be that you would sign where it says" Signature of Printed Name of
Seller/Owner/Lienholder:" as you are the owner of the vehicle.
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