1. Please login to your FileBoom account https://fboom.me/
(If you don't have a FileBoom account, please register a new account)
2. You will receive a premium key like this: 3be4cc6265f7e28da49dc4cdc357b4daaaaaaaaa that you can exchange here: https://fboom.me/auth/code.html
3. Enter Premium key in field with that description "Code" and click "Submit" button.