Buy Now button instead of add to cart option in virtuemart

[dharmesh]

I have a website in Joomla 3.5, in which I am using virtuemart 3.2. Now on product details page I want to remove add to cart button and want to show buy now button. And when anyone clicks on this buy now button users should go directly to the payment gateway. I also want to use checkout as guest process. Please suggest.