This is to decide for you in what currency to make a deposit. It’s convenient for me to do this in the euro or in general sometimes sry my cryptocurrency. But with bitcoins, everything is not so simple for me, so this is more often euro. You can make a deposit in American or Australian dollars. If something is incomprehensible, then you can learn more or contact the technical support of the site. But there is nothing complicated here. And with the withdrawal of funds. Choose the banking system that suits you.