Do not edit the Twenty Eleven theme. It is the default WordPress 3.2 theme and having access to an unedited version of the theme is vital when dealing with a range of site issues. Create a child theme for your changes. Once your child theme is active, we should be able to help with the customisation.
I just tried, I watched a youtube video on how to create child themes. Which part of the 2011 html code do i use?
The page width in Twenty Eleven, depending on which layout you are using, is set by.
/* regular layouts */
#page {
max-width: 1000px;
}
/* One column */
.one-column #page {
max-width: 690px;
}
If you’ve already created your child theme, just add either of those to t, and set the max-width to whatever you want.