We do not sell Crypto Mark, we only give it away for free. However, there is the possibility to trade the Crypto Mark at the Ethereum Token exchange “Etherdelta”.
To use Etherdelta you will need your wallet address as well as the private key or the plug-in for the Chrome browser Metamask. For security reasons we would suggest you to take Metamask. Mobile wallets are not compatible.
A detailed FAQ you will find here: