There is no "Uninstall" function included yet, so here just a list of required steps to remove FtFind completely:
1.) Databases
Databases created with FtFind can be deleted with the [Drop] button on window "File: Open database".
2.) Registry
FtFind stores user specific settings like MySQL connection info
and window positions in the registry under: HKEY_CURRENT_USER\Software\Tools\FtFind
3.) Files
There are no other files used by FtFind except the ones you have
previously installed (e. g. FtFind.exe). Just delete these files
and you're done.