Click on the "Orders" tab in the sidebar, a sub dropdown menu appears.
Click on the "Cart Rules" sub-tab.
Click on the "Add new"
Name the cart rule.
Create a code associated with the rule. You can also generate a random code by clicking the "Random code"
Set the priority of the rule.
Choose whether partial use of the rule is possible or not. Example: A client receives a 10€ discount with promo code (cart rule). If he buys a 3€ product by filling in the code, he will not pay anything for his first order and receive a new discount code of the remaining amount (7€).
Select the conditions of use of the cart rule: limiting to a single customer, period of validity, minimum amount, number of use of the rule.
If necessary choose to put restrictions.
Finally, choose the discount amount to be applied to the rule as a percentage or amount.