Placing the guestbook into an existing framework

I have tried to place the guestbook in my site setup, without luck so far...I have also tried to place the Gb in an Iframe, when the poage opens I only see this message
show_entries($entry); ?>
Is there an easy answer to this?

At worst I can open the Gb as a stand alone but cannot add a link back to site button in the GB.

I don't appear to have permissions or know where to change them.
Thanks