1. Please log in to your Real-debrid account first: https://real-debrid.com/

( If you don't have an account, please register a new account )

2. Premium key / Premium coupon can be used here once you are logged in to your account:

Access https://real-debrid.com/voucher

3. Paste your Premium key / Premium coupon in "You have a reseller's code ?

4. Choose "24instant" or "Utop.us" for question"What is the origin of this voucher ?" and click "Convert" to proceed.