Maybe you've read somewhere that there's a process for claiming a complimentary card. Unfortunately if you're not sure what this is about, chances are, it doesn't apply to you.
The complimentary cards are for users who contributed more than 25 ETH during the Token Presale and Token Sale phase that ended on 24 June 2017. These users are eligible for a special card that will only be ready in Q4 2017. This is why they have been granted a code to redeem a complimentary card to tide them over until then.
If you suspect that you belong to this group of users, please check your email for the code. If you haven't received the code, please log a support ticket with your contribution transaction hash and your TenX account email address.