I’ve been doing some minor tweaks to the checkout confirmation page in Magento. The changes originally came from adding customer comments to the checkout process. (More to come later.)
For reference, if you would like to add text, boxes, etc. towards the bottom of hte last step of the checkout page, it’s best to add them to the agreements.phtml found in design/frontend/default/yourtheme/template/checkout/onepage.
Also, the success page is in the same path, but with the success.phtml file.