Swap buttons in checkout

-- url of the page with the problem -- : joomla-support.co.nz/index.php
-- HikaShop version -- : 3.5.1
-- Joomla version -- : 3.8.11
-- PHP version -- : 7.0.29
-- Browser(s) name and version -- : firefox 59.0.1

How do I swap the "Continue Shopping" and "Next" Buttons on the checkout pages.
Which specific file?

Refer image

Thanks

Thanks with info provided was able to adjust button layout.