If you have a code to add data or to upgrade to a Pro plan, here's how you can claim it:

1. Log in on our website here: https://windscribe.com/login
2. Go your Account page: https://windscribe.com/myaccount
3. Scroll down and click the button labeled Claim Voucher. (Please note you will not see the Claim Voucher button if you are already a Pro subscriber.)
   
4. Then enter the code and press Claim
   
5. You're done! You should see the upgrade right away. Please note that if you are on a Free account, you need to have a confirmed email address to get more data.