Click on Marketing and then on Promo codes.

Click on +New promo code.

Name the promo code you want to create, "Yoga 50% off" for example.

Create the promo code itself, in this example, it will be "Yoga50OFF".

Choose if the discount will be with a percentage or a fixed amount, like 50 % (you can also do a fixed $5 amount).

Select if the promo code can be used once, forever, or for multiple months. If you choose the last option, then enter the number of months you would like the code to be available.

Choose the expiration date and number of clients that can redeem it, if you want to.
​Note: If you click on Advanced options, you get 2 extra features. You can make the promo code only eligible for the first time a client makes a purchase and you can also require a minimum order value for the code to be valid.
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Once you're done, click on Create.