Automate shopify discount

In Shopify there is the possibility to create a product discount. We would like to create a product discount where the customer receives 1 free product. When I create the discount, Shopify writes "Customers must add the number of items below to their cart". This is of course totally inconvenient for the customer. Is it possible (without Shopify Plus) to adjust this in the code? If so, please offer to do so. Do only offer, if you are familiar with Shopify and if you know how to ask for a guest access! Please do not offer with a placeholder price. If you understand this, please mention *YES, I'M REALLY INTERESTED* in your offer.