How to write a field for a promotional code in Woocommerce?

Question

WordPress

Hello! There is a site - profcopter.ru
There is an ordering page - profcopter.ru/checkout
Here on the ordering page, there is no field "Do you have a coupon?", There is no field at all, there is not even where to enter. Coupons created, did everything. And there is no input field itself, tell me what could be? The promo code will activate free shipping, I have already done everything, but the field is still missing.