The tokens are not sold. You can exchange these tokens to CNX coin 1:1 in backoffice.
For this you should sign up and transfer CNX (ETH) tokens from your Ethereum wallet.
You can use your bonus. If you buy CNX coin in your Cryptonex account, you get the bonus of 20%.

For example, you transfer 1000 CNX (ETH) tokens and purchase 5000 CNX coins, using BTC or ETH.

You get 6000 CNX coins.