US Cryptocurrency Exchange. This is the first step to buying BNB. Move your Bitcoin or Ethereum back to Coinsquare, sell it for the fiat currency of your choice, and withdraw your fiat currency into your bank account. Disclaimer: Cryptocurrencies are speculative, complex and involve significant risks — they are highly volatile and sensitive to secondary activity. For this step, we will assume you deposited ETH. Follow Crypto Finder. Your Question.