Windows: Run the installer (which, if you're reading this, you already did.)
Macintosh: Put the application wherever you like. On multi-user systems, to make FTPhoto available to everyone, the Applications folder is the best place. Optionally create an alias on your desktop or Dock.
If you are upgrading, your existing user profile and preferences are saved.
All illustrations are from macOS, but different platforms will view similarly.
On first launch, a welcome screen (Fig. 1) will appear, in which you enter all your personal contact information. On multiple-user machines, each user will have his or her own profile and preferences.
This screen will be by-passed whenever you launch the program in the future. If it ever becomes necessary to edit your profile, you may access it from "User Profile.." in the Edit menu.
Figure 2 shows the main program window, as it initially appears.