You can open account with the broker proposing cryptocurrency.
Example (MT5) -
Forum on trading, automated trading systems and testing trading strategies
Where can I trade bitcoin though MT4?
Sergey Golubev, 2017.05.08 12:34
There are some brokers for Bitcoin/USD for MT5 (I do not trade bitcoin for MT4 so I have no idea about MT4 broker for bitcoin):
I would like to make cryptocurrency graphs available to me as I can do?