how to add quantity increase/decrease

Hi
There is increase/decrease button at product detail page

hikashop_product_quantity_field_change_plus_1
hikashop_product_quantity_field_change_minus_1
how to make it the same as product detail page at checkout page

how to add quantity increase/decrease button at checkout page

Hi,

There is no easy method if you're not a developer because you'll have to edit the file "cart" of the view "checkout" via the menu Display>Views and add custom HTML/PHP/javascript code in order to handle that.
If you're not a developer, I would thus recommend to find one to help you with that customization.