1. You will receive a premium key like this: 88dn92yeyoyoxxx
2. You should be log into your account. (If you haven't account, you just need to sign up free account)
3. Make sure you are logged in. Then access this link: https://sunexenus.com/?op=my_account
4. Paste your Premium key in "Apply Premium Key" and click "Apply" to proceed.