The listing, Blade & Soul (beta key) has ended.
You will need an NCAccount in order to redeem your code.
Once you have logged into your existing NCAccount or created a new NCAccount, you will need to go to your Account Management page and enter the code via the “Apply a Code” section. Once the code has been entered, and you’ve clicked the “Activate” button, you will need to navigate to the “Blade & Soul” tab in the Unused Serial Codes section. From there, click “Apply” on the Closed Beta coupon code.
You will receive a confirmation email when your code has been applied.
To check on the status of your Closed Beta code redemption, go to the “Transaction History” section of your Account Management page, and check the tab “Blade & Soul” in the subsection “Serial Codes.”
Further Instructions on how to redeem your code can be found here.
You will not be able to access the game until the start of Closed Beta on Oct 29 at 10AM PDT.
https://support.bladeandsoul.com/hc/en-us/articles/205652005-How-do-I-use-my-serial-code-
http://www.bladeandsoul.com/en/