Hi!
I apologize for any inconsistencies that language but I am a Pole and Polish support members will not be too much interest in my topic.
I would ask what file do I change the width of the entire board.
Thank you for your reply, I greet!
Translated by Uncle Google: P
what forum version and theme?
If using the default theme look for this in Admin/Current Theme:
Forum width:
Set the forum width. Examples: 950px, 80%, 1240px.
If using a custom theme look for the "wrapper" settings in index.css or style.css, depending on which version of SMF you are using.
;)
keep in mind that, that will only work on 2.0 not 1.1.1* and the op has not told us what version they are running.
also not all themes contain a wrapper id or class.
Even it's not there, it's not exactly hard to just add one in, or equivalent. :P
But, like Runic said, the theme and version number are both needed for us to be able to help you better.