@Grace814 Have you read the PDF that is on the tax website?
https://floridarevenue.com/property/Documents/dr405.pdf
After a cursory glance, it appears that this is a personal property tax form. If your property is a stand alone (not shared) rental property, you would have to list the appliances installed, the rental property furnishings, large ticket property improvement costs and supplies consumed by guests and/or used by housekeeping. Specifically, Lines 16, 16a, 20 and 23.
Your local County tax office may have persons who can assist you with this form.