How to activate Uptobox Premium Voucher:
1. You will receive a Uptobox premium voucher like this: 79xxdlnd5774la68
2. You should be log in : https://uptobox.com/login.html
( If you haven't account at Uptobox, you just need to sign up: https://uptobox.com/?op=registration )
3. Make sure you are logged in. Then access this link: https://uptobox.com/?op=voucher
4. Put your voucher code in field "Apply Premium Key", and click on "Apply"