You'll need to go to your cp.cgi and log into the control panel.
From there go to
Display Options -> Styles
You can edit your styles from there, which included the header/footer/header insert info.
While here at this forum, check out the "ubb.classic documentation" topic I started that's stickied to the top of this forum. There's a world of info there for the checking. You can learn lots. Begin with the "Admin Guide" link.
