Hitoby,  Pete waves

This link might be a useful starting point
http://www.lunarforums.com/forum/viewtopic.php?t=21544

if you only want to make changes to the top of your forum to include the header you are also using on your site,  the only file(s) you need to edit is overal_header.tpl
(for every template you are using on your forum)

changing every file to a different width will take some time. and be careful, it could at some point mess up the layout of the forum.
remember to always have a fully back up of your forums files in case something weird happens.

another option is to find a theme (or templates, whatever you call them) that doesn't use the full page/screen width

you can find a lot of themes like that.
It will take less time


Installing themes isn't hard. all you have to do is download it, unzip the folder in your /themes/ directory
and then in your administration panel, "INSTALL" theme
and you're done.
afterwards, you can still edit the overall_header

FYI. That's simply done by embedding the flash logo instead of a regular logo.