How can a student use their discount promo code on the RMT platform?

If you received a special promo code (only available during some holiday promotions) you can enter it in the "HAVE A COUPON" field:

If you don't see the Promo Code or Discount Coupon field on the Payment Methods screen, it means that you are already getting a special discount from the teacher, and you cannot use the discount coupon with any other offer. If you do see this field, but your coupon still doesn't work, it is because the coupon has already expired or you have exceeded the maximum number of uses for the coupon.

Note that you can't use a promo code to add funds to your wallet. You can only use it when purchasing lessons, with either a credit card, PayPal, or wallet funds.