Currently fiat currencies (US dollars, euros, British pounds etc.) are not supported on the exchange as trading instruments. And there is no way to associate your HitBTC account with your bank account.
However, you can buy Bitcoin using your Visa card. This option is available on the very top of your Account page and is provided by our partners from Changelly.
You will need to send the purchased coins to your BTC deposit address on HitBTC.