Gk_appsite Virtuemart Problem

I am trying to install and use virtuemart to gk_appsite template. But it crashes. I will sell only one product. Flypages are crashed so I have decided to add an add to cart button to an article and use this article instead of flypage layout. But the order confirmation page crashes as well. There is no confirm order button at the end of the page. I think there is a problem with buttons of gavick pro template. I am using paid powered by virtuemart theme called pbv_magenta Please check the attached screenshot. How can I fix this issue ?

Website is www.joomexa.com
Flypage url is: http://www.joomexa.com/index.php?option ... Itemid=139

Please help me to resolve this button issue. thank you.