Guestbook Issue - Chmod a file

Hi, can someone help me please!!

I have downloaded and establish a guestbook on a site I constructed. All the guestbook elements are there but when launching the site the guesbook doesn’t work properly. I know I need to check with my IP to see if certain file has the necessary permissions to be run in there.

What file is the one I need to check ? is it the PHP? if so, what is it that I need to do?

Also, I know I have to chmod certain files but which ones are those and what chmod numbers I have to assign?

Anyone knows the process to help me out, I need help…

I will appreciate any input

oh, the guestbook is on:

www.flavalive.com and then click on the guestbook and you’ll see what I mean. It doesn’t work : (

Help!
Ed