Checkout not working

-- url of the page with the problem -- : mumasupial.com.au/
-- Joomla version -- : 3
-- PHP version -- : 5.4
-- Error-message(debug-mod must be tuned on) -- : Checkout doesnt work. No error message

Hi Guys,

I need an urgent help for my site mumasupial.com.au/ . The site works well until the last step of checkout. I can add items to cart but cannot make it till the payment. Any help here would be appreciated.

Hello,
Can you show me some screenshots of how did you configured your checkout workflow (Hikashop->System->Configuration->Checkout) ?