How to Edit Checkout Page

I am in the process of setting up a store with the YourShop template, using VirtueMart and Joomla 2.5.

The cart on my store looks completely different to that of the YourShop demo and I'd like it to look like the demo.

Can anyone offer any advice?

Thanks

The site I'm working on is http://citycm.co.uk/clients/cubiclefitt ... x.php/shop

The demo site is http://demo.gavick.com/joomla15/nov2010 ... Itemid=178