MarketPress Payment Gateway not appearing

I have a new install of WPMS and MarketPress running, and I've added in my PayPal information, although not a App key as I'm not granted one until the site is operational. However, when you try to do a test purchase, no payment options appear so the transaction cannot continue.
See http://store.bellringing.org/teststore/store/shopping-cart/checkout/

All help appreciated! Thanks, Rob