Forum/Website Help

so, im kind of a newbie when it comes to editing html/php,etc. code…so i was wondering if anybody knew how i could stretch the forum across the entire computer screen?
http://madc.netii.net/
kind of like this…?
http://www.nobsclan.com/
ive looked through all of the settings in the forum, and i cant find anything to change it…
Answer #1
nobody?