Step-1: General tab
Now you are on general tab where you could give basic details about your discount rules.
Step-2: Condition tab
On condition tab, define your discount condition and click next. In our case, we wants the discount to be applied all products so choose All products to "Apply To" option.
Step-3: Discount tab
Now you are on discount tab where you could set the quantity range and discount type for your discount rule.
Step-4: Frontend demo