How to Widen Page Area

Finished Look:

This will be your website with the new widths in place.

Go to:

Dashboard / Appearance / Editor / style.css

Code:

.columns-two #page {
width: 900px;
}

.columns-two #primary {
position: top left;
width: 600px;
padding: 10px;
}

Back End Example:

Your dashboard should look something like this.