Lucky you!
Promotion Codes can be redeemed directly in the app. In the app menu you will find the button "Redeem a code".
Did you get a promotion code for a free registration/registration for 4,95€ with more than the standard 4,95€ riding credit or were you referred by a friend? To sign up under promotion or friendship conditions at emmy, enter the code in the “Redeem Promo Code” field during registration.
Please note: Check the validity of your redeemed promo codes in your menu to use all of your valid promo credit!