No payment information shows up (urgent)

Marketpress has been installed on a blog and when someone goes to buy the product there is no payment information when they hit checkout and then they receive a paypal error. as this is for an event that happens next week and people are trying to pay I appreciate URGENT reply.
Codes have been set up to allow for discounts at the event. The url is

http://healthylifestyleseminar.co.uk

thanks