Firstly you must purchase some ETH then go to ETHERDELTA exchange and get a minimum of 501 COB COINS which you will need to upload before the 5th January to the COBINHOOD EXCHANGE. Then you will pay 1 COB and in exchange get a percentage, just under 5% of your COB VALUE in CMT. There is a calculator somewhere, they have it in the telegram group where you can see how much CMT you wll get for the COBS you own.