Issue with re-direct to empty page after checkout?

Hi,
Currently after checkout, the user is sent to an empty page. how can i change that to something else?

Marketpress and setting up the destination after checkout
currently it re-directs customer to http://www.domain.com/thankyou-for-your-order/ page which has nothing there - http://monosnap.com/image/lreVKKLmd0JOMQ8ZGKK60r8tvdsMbK
Can you tell me where i can find the settings to change the destination link? Thanks
tom
Domain: http://tinyurl.com/o56h34m

this is where i need it to go /book-a-bike/ - http://tinyurl.com/o6xxhek
this is where it currently goes /thankyou-for-your-order/ - http://tinyurl.com/ojkkkph

http://monosnap.com/image/huIFs25p9TmEmbX5R8K8WplDd3uTfQ

Payment gateways Stripe +MyCRED - http://monosnap.com/image/kIg77lcDQ6Oqhm2YiWdIqxUgq6zDmA

Support Access is open

Thanks

Tom