Message # 1
How can I remove the "New Window" setting after I click on GuestBook? I click on it and it makes a new window. I know I checked that it should do that, but how do I uncheck that now?
Message # 2
you could give more info about where you click on a guestbook link.
If the link is in site menu then you should continue with your question here:
I will help you in here but with new questions use search next time.
go to CP --> Site Menu Builder ---> Find Guestbook in the menu ---> Click the Edit icon ---> uncheck "open in a new window"
Message # 3