Your link on how to redeem the code is out of date from the current setup.
For those wondering, that haven't used Hashnest first, once your get your redemption code from the email.
Go to the following: On the top bar, click Finance. Then on the side buttons select Hash.
Next select Ants4 redeem code button (since this offer is for the Antminer S4 series).
Enter in code and push redeem. It will come up and say "Already Recharge."
To see the hashing power in action. Follow @Redacted post above and click the Status button on top, then the BTC Miner tab.