You must be signed up for Kohl’s emails in the first place to receive this offer on Saturday 5/18.
(Https://kohls.com/feature/sale-alert.jsp)

To use at Kohls.com: Enter the code from your email during checkout.
To use in-store: Present the email during checkout to apply the discount.

Valid for use online or in-store
Valid Saturday, 5/18 only

* Promo code valid for one-time use only (cannot be shared)