Once installed you run it run from the menu. Start Menu under Program Files - XitNotes. Please let me know if you don't see it there.
Is it installed in the notes.exe directory? i.e. c:\Notes5\ or c:\lotus\notes or something like that.
If not in the same directory as notes.exe, there must be a path to the notes.exe directory.
If you don't have one you can set one up please let me know if you need help doing that.