19 September 2010 at 3:14pm
Welcome to the Forum in that case :)
To centre-align you should use the css rule "margin: 0 auto;" either: 1. combine this rule with each of the container elements in question, 2. add a css class with this rule to each of the container elements or, 3. wrap everything inside the body tag (as this theme doesn't have a wrapper already) in a new div with this rule applied to it.
personally I'd go for option 2. I try to avoid non-semantic markup whenever possible. You may need to make a couple of other adjustments because of existing rules (padding etc).