One way to purchase C10 is to invest in ETH via the smart contract. We have an article on doing this here.
Alternatively, you can purchase in BTC/ETH/DASH/TUSD through the user portal after completing KYC. Persons from the United States, South Africa or the Cayman Islands are unable to complete KYC.
C10 tokens will be sent to the ETH address nominated on your account. Please ensure to nominate an ERC20 compatible address.
For information on creating a compatible wallet please see this article.