[Plugin: WP e-Commerce] Add product details to checkout page

Is there a way to add a text box onto the checkout page for ech product that people can edit to add names ect. into to personalise the product?
https://www.familynameorigins.co.uk This is the site i’m working on, and what they need is a surname/ firstname box added to the checkout page that then sends on the details to the owner.
Anyone help?

https://www.ads-software.com/extend/plugins/wp-e-commerce/