Posting in the Magento forums has been disabled pending the implementation of a new and improved forum solution which should better serve the community.
For new questions please post at magento.stackexchange.com, the community-run support site for the Magento community. We will be providing updates on the new forum solution soon. For questions or concerns please email firstname.lastname@example.org.
You need to go to page.xml and change it from 3 colums to 1 column. Then you can look at the 1 column.phtml file in pages directory and figure out which CSS attributes you’d have to change to center it all. to center just do margin: 0 auto;