how to create discount

-- HikaShop version -- : 2.3.5
-- Joomla version -- : 3

I don't understand how to apply discount.
I created a discount, but it don't apply on product of choosen category
sorry for me to ask a simple question but I tried a lot and don't work

here the screenshot of my discount

Hi,

Please give a screenshot of that discount.

You have selected a category, so the discount will only be applied on the products of that category, are you sure that the product are not in a sub category of the selected one ?