Hello,
the guestbook folder is automatically created by the program if it doesn't exist yet.
If you want you can use an already created folder, just be sure that you have read/write permission on the folder you will use (created by you or not).

**** GOOGLE TRANSLATION ****

Hola,
la carpeta de guestbook se crea automáticamente por el programa si no existe todavía.
Si lo deseas, puedes usar una carpeta ya está creada, sólo asegúrese de que usted ha leído / permiso de escritura en la carpeta que va a utilizar (creado por ti o no).