1. You will receive a Premium key / Voucher code should look like this: 16xxdlndescf4layyy
2. Login into to your File.al account. ( If you haven't account, you just need to sign up https://file.al/?op=registration )
3. Then access my account: https://file.al/?op=my_account
4. Put your voucher code in field "Apply Premium Key", and click on "Apply"