如何修改opencart 2.1.0.2版本中的结帐确认步骤中的数量？

I am using opencart version 2.1.0.2, I wants to modify quantity of product before click on confirm button on checkout page.

Currently on opencart checkout step-6 confirm display only quantity of product, but how can I modify quantity there as same as cart page.

Thanks

You would need to write a core modification for the last checkout process step. Currently the last step (confirmation) is only the display of your entered products and their amounts.

I would not recommend changing the amount of a product at this stage. Why would you do so? Is changing the quantity in the basket not enough? Most commerce systems display a summary at the end of the checkout process. Why can't you keep with this "almost" standard?