Agents are required to register and file a certified copy of the power of attorney with both the Clerk and Sheriff by April 1st of each odd-numbered year in the county in which the agent resides. (FS 648.42)
The Clerk may not permit registration unless the agent is currently licensed and appointed by the department of Financial Services.
An agent may also register in any other county. Below is the (fillable pdf) Bondsman Registration Packet which must be filled out.